Fix deletion fail
Update flyway for 3.0

Also update several other dependencies (but skip RichFaces and JSF because they
just break horribly)
Drop pointless DAOs
Allow filtering and sorting project names in the version list
Add space between server names
Drop obsolete column id_mavenrepository from project
Enable delete button in the overview

It is necessary to see the detailed error message, so the admin can figure out why
deletetion is not possible. Also checking for attached projects causes a select for
each VCS host
Bugfix: Fix deploying single versions

The transaction was never committed, so just nothing happened.
Allow filtering versions per VCS tag
Implement deleting maven repositories
Drop unused imports