pyfaf: find-crashfn, show progress even for up-to-date backtraces
pyfaf: get base package name from Report.component for unknown packages
pyfaf: stats text-overview, show bthash even if webfaf is not installed, don't make conclusions about non-probably fixed problebs
pyfaf: Problem.crash_function now returns the most common crashfn among its backtraces
pyfaf: add tests for mark_probably_fixed
Merge pull request #292 from abrt/little_fixes

Little fixes and improvements for pyfaf