[backend] use a prefix instead of a suffix for the sibling in the workerstatus
Encode time in jobnames for import events

That way, sorting by jobname results in correct event ordering.
[backend] getprojpack: also put filtered projids in remotemap
[webui] rework flash code

:note is a OBS only thing, :notice is rails. Same with :warn and :alert
[api,webui] use dalli instead of memcache-client