Bug Fix Release

Added support for Test Cases. Fixed latex2 output: there was a bug that the references were printed many times when there were more than one reference to another requirement. Fixed error reporting: there was an error that problems during parsing the requirements / topics / constraints directories were not reported to the user at all. Instead a python stack trace was printed. This was fixed: now the user sees exactly the problems - if there were some. Fixed long path names in graph2 output: Since v22 it is possible to use subdirectories with requirements. This results in long names. These long names are now split up into some lines - with the '/' is the indicator where to split. Fixed priority list output: there was a bug that only the requirements were used for the prios list which are in the last topic worked on. This is fixed now: all requirements appear (again) in the prios list.