Feature/256 difference images
When a comparison to a reference image fails, now an additional difference magnitude image is written out to facilitate analysis.
Also removed bugs in the OpenGLImageBuffer class.
@ademiralp , @mbellgardt
Aufgrund einer Wartung am 14.05 von 8:00 bis 09:00 Uhr wird das System kurzfristig nicht zur Verfügung stehen. -- Due to maintenance on May the 14th from 8:00 am to 09:00 am the system will temporarily not be available.
When a comparison to a reference image fails, now an additional difference magnitude image is written out to facilitate analysis.
Also removed bugs in the OpenGLImageBuffer class.
@ademiralp , @mbellgardt