fix some minor issues with the documentation

README.md

@@ -35,4 +35,4 @@ to make the documentation:
 
 ### License
 
-libcoincellhell is licensed to you under the Apache License, Version 2.0
+libcoincellhell is licensed to you under the BSD-3-CLAUSE license

doc/DoxygenLayout.xml

-<!--
-    Copyright (c) 2023 Carl Klemm <carl@uvos.xyz>
-    All rights reserved.
-
-    Redistribution and use in source and binary forms, with or without modification,
-    are permitted provided that the following conditions are met:
-
-     * Redistributions of source code must retain the above copyright notice, this
-    list of conditions and the following disclaimer.
-     * Redistributions in binary form must reproduce the above copyright notice,
-    this list of conditions and the following disclaimer in the documentation and/or
-    other materials provided with the distribution.
-     * Neither the name of %ORGANIZATION% nor the names of its contributors may be
-    used to endorse or promote products derived from this software without specific
-    prior written permission.
-
-    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
-    ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-    ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
--->
+<?xml version="1.0" encoding="UTF-8"?>
 <doxygenlayout version="1.0">
-  <!-- Generated by doxygen 1.9.3 -->
+  <!-- Generated by doxygen 1.9.8 -->
   <!-- Navigation index tabs for HTML output -->
   <navindex>
     <tab type="mainpage" visible="yes" title=""/>
     <tab type="pages" visible="yes" title="" intro=""/>
-    <tab type="modules" visible="yes" title="" intro=""/>
+    <tab type="topics" visible="yes" title="" intro=""/>
+    <tab type="modules" visible="yes" title="" intro="">
+      <tab type="modulelist" visible="yes" title="" intro=""/>
+      <tab type="modulemembers" visible="yes" title="" intro=""/>
+    </tab>
     <tab type="namespaces" visible="yes" title="">
       <tab type="namespacelist" visible="yes" title="" intro=""/>
       <tab type="namespacemembers" visible="yes" title="" intro=""/>
@@ -40,29 +18,29 @@
     </tab>
     <tab type="interfaces" visible="yes" title="">
       <tab type="interfacelist" visible="yes" title="" intro=""/>
-      <tab type="interfaceindex" visible="$ALPHABETICAL_INDEX" title=""/> 
+      <tab type="interfaceindex" visible="$ALPHABETICAL_INDEX" title=""/>
       <tab type="interfacehierarchy" visible="yes" title="" intro=""/>
     </tab>
     <tab type="classes" visible="yes" title="">
       <tab type="classlist" visible="yes" title="" intro=""/>
-      <tab type="classindex" visible="$ALPHABETICAL_INDEX" title=""/> 
+      <tab type="classindex" visible="$ALPHABETICAL_INDEX" title=""/>
       <tab type="hierarchy" visible="yes" title="" intro=""/>
       <tab type="classmembers" visible="yes" title="" intro=""/>
     </tab>
     <tab type="structs" visible="yes" title="">
       <tab type="structlist" visible="yes" title="" intro=""/>
-      <tab type="structindex" visible="$ALPHABETICAL_INDEX" title=""/> 
+      <tab type="structindex" visible="$ALPHABETICAL_INDEX" title=""/>
     </tab>
     <tab type="exceptions" visible="yes" title="">
       <tab type="exceptionlist" visible="yes" title="" intro=""/>
-      <tab type="exceptionindex" visible="$ALPHABETICAL_INDEX" title=""/> 
+      <tab type="exceptionindex" visible="$ALPHABETICAL_INDEX" title=""/>
       <tab type="exceptionhierarchy" visible="yes" title="" intro=""/>
     </tab>
     <tab type="files" visible="yes" title="">
       <tab type="filelist" visible="yes" title="" intro=""/>
       <tab type="globals" visible="yes" title="" intro=""/>
     </tab>
-    <tab type="examples" visible="yes" title="" intro=""/>  
+    <tab type="examples" visible="yes" title="" intro=""/>
   </navindex>
 
   <!-- Layout definition for a class page -->
@@ -70,7 +48,7 @@
     <briefdescription visible="yes"/>
     <includes visible="$SHOW_HEADERFILE"/>
     <inheritancegraph visible="$CLASS_GRAPH"/>
-    <collaborationgraph visible="$COLLABORATION_GRAPH"/>
+    <collaborationgraph visible="yes"/>
     <memberdecl>
       <nestedclasses visible="yes" title=""/>
       <publictypes title=""/>
@@ -169,8 +147,8 @@
   <file>
     <briefdescription visible="yes"/>
     <includes visible="$SHOW_INCLUDE_FILES"/>
-    <includegraph visible="$INCLUDE_GRAPH"/>
-    <includedbygraph visible="$INCLUDED_BY_GRAPH"/>
+    <includegraph visible="yes"/>
+    <includedbygraph visible="yes"/>
     <sourcelink visible="yes"/>
     <memberdecl>
       <interfaces visible="yes" title=""/>
@@ -206,9 +184,10 @@
   <!-- Layout definition for a group page -->
   <group>
     <briefdescription visible="yes"/>
-    <groupgraph visible="$GROUP_GRAPHS"/>
+    <groupgraph visible="yes"/>
     <memberdecl>
       <nestedgroups visible="yes" title=""/>
+      <modules visible="yes" title=""/>
       <dirs visible="yes" title=""/>
       <files visible="yes" title=""/>
       <namespaces visible="yes" title=""/>
@@ -254,6 +233,25 @@
     <authorsection visible="yes"/>
   </group>
 
+  <!-- Layout definition for a C++20 module page -->
+  <module>
+    <briefdescription visible="yes"/>
+    <exportedmodules visible="yes"/>
+    <memberdecl>
+      <concepts visible="yes" title=""/>
+      <classes visible="yes" title=""/>
+      <enums title=""/>
+      <typedefs title=""/>
+      <functions title=""/>
+      <variables title=""/>
+      <membergroups title=""/>
+    </memberdecl>
+    <detaileddescription title=""/>
+    <memberdecl>
+      <files visible="yes"/>
+    </memberdecl>
+  </module>
+
   <!-- Layout definition for a directory page -->
   <directory>
     <briefdescription visible="yes"/>

doc/mainpage.txt

@@ -2,7 +2,7 @@
 
 libcoincellhell is a shared library that allows you to control coincellhell devices
 
-An API reference can be found here: \subpage API
+An API reference can be found here: \ref API
 
 libcoincellhell is licensed to you under the BSD-3-CLAUSE license
 */