[backend] the big sibling->partition, partition->partitioning, partitions->partitionservers rename
[dist] start more then one worker by default

(move OBS_WORKER_INSTANCE_NAMES to zVM specifics)
[backend] support a 'badjob' return in the dispatcher, make bs_worker report bad job names
[webui] Fixed routing-error for add_maintained_project (post not get)