M2 repo editor: clean upload area text after successful upload.
bz-973574: Button 'Delete selected jar' does not work in Guvnor M2 repository tab
improving exception reporting and preventing broken jars to be uploaded
(cherry picked from commit dd6d1e324b337127e77d6bdffdda111a155998ef)
remove audit from m2 repo editor as it is implemented in 6.0
upgrade to 6.0.0.CR2