added wrapper class for polymake. listening threads pendning.
added log listener for error output of polymake
implemented stop method of polymake wrapper
applied formatter on polymake error handler
implemented result fetch loop in polymake wrapper package
adjusted polymake driver to work with new wrapper
added autoflush to stdout in pmDriver
reworked main executable to use new wrapper
Merge branch 'polymakewrapper' of github.com:Ryugoron/point-groups into polymakewrapper
Deleted obsolete variables causing a NullPointerException
Added controlled shutdown of concurrent listeners
improved logging and shutdown procedure
inserted forgotten newline
inserted ending line