update sources/new issue URLs
retry now prints traceback too
storage: add bunch of convenience __str__ methods
storage: change number of methods to properties
storage: add ReportBacktrace.as_named_tuples method
storage: add Problem.type & Problem.reports_count
add pyfaf.support.as_table function
storage: add bunch of backrefs to report classes
add faf-bugzilla-create-bugs
Update NEWS and delete empty ChangeLog