Infrastructure patch 3

• Added 3 levels of testcase generation as discussed in last meeting
• Instructions how to update the generators:

#!/bin/bash

sed -i '2i from scripts.Infrastructure.Variables import *' $1
sed -i 's/generate_full_set/generate_level/g' $1
sed -i 's/if not generate_level/if generate_level <= BASIC_TEST_LEVEL/g' $1

• Added basic cmd lina arg parsing to main.py