[backend] rework dbgsplit code, make packtrack available to plugins

- packtrack needs to be mixed
- deleterepo needs the repoinfo for subdir
[backend] modernize publisher to use store/retrieve from BSUtil
[backend] small code cleanups
report patchinforef in packtrack data

also report supportstatus for testing purposes
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/backend/bs_publish
publisher syntax fix
[api] store also patchinfo packager in database