daca2: improved command line flags
daca2: handle xz compression
Fixed #5082 (False positive: (error) Possible null pointer dereference: p2)
Extended Qt support through Library
autopep8 formatting
Fixed #4929 (False positive: possible null pointer deref (checks dont handle && and || well))
Fixed #5105 (false positive: (warning) Either the condition 'b!=0' is useless or there is division by zero)