display counters status in /status webservice
dashboard: split job table with queued/popped subtables
dashboard: grouping popped jobs by updated_at attribute, filtering is active only on popped jobs
dashboard: added separate queue subtable, sorted by expected priority in queue
source file specification allows pattern to match multiple files, target filename defaults to source filename if not provided, some refactoring
moved some queue sorting code code to JobQueue
Job.id is now build from a process-local prefix and a local-counter, Jobs can be searched by full ID or local-counter only in the URL
cleaned up exceptions, small other changes
ftp_transfer: added logic to remove remote file first if overwrite=true
version bump to v0.90