[backend] support to show last finished build logfile. Add all existing and new API parameters to  documentation.
[api] add group xml and rng file to define groups of persons
[backend] fix hostlabel structure from prjconf again
[api] Delta indexed disabled
[webui] do not crash, when the request has no target specified in its first action
[webui] do not crash when a request has no target and fix cache handling for multi-action-requests
[webui] Fix typo in layout header
[webui][api] added edit/delete functionality with permission checks
[webui][api] edit and delete both route through different methods now.
[webui][api] refactored permission check. Added condition for required params. Handingly unknown request ids for comment