[selectors] modify workflow selectors: is_in_state, on_transition - factorize `is_on_state` selector - add new `on_transition` selector Especially useful to match pending transitions to enable notifications when your workflow allows several transition to the same states. Note that if workflow `change_state` adapter method is used, this selector will not be triggered. In debug mode: These both selectors will check against the entity current workflow if expected values given in selector argument are valid. ValueError exception will be raised for unmatching state/transition names against the current workflow (generic etype workflow). (check against custom workflow is not implemented)

[cw-ctl] use default `mkdtemp()` behaviour to store backup file internally When using `mkdtemp(dir=instbkdir)`, a dedicated system user which hasn't the permissions to write in /var/lib/cubicweb/instances/$INSTANCE/backup will not be able to run the db-dump command.

[debian] fix lintian errors

[devtools] fix understanding of boundary constraint on db automatic population

[rset] fix entity building for some result set with UNION and subqueries

[c-c] lgc 0.54 check for duplicated commands, this may occurs with cw where plugins are automaticall (re)loaded

[utils] support_args now support classes, searching if __init__ supports the arguments

[schema sync] fix crash when bad inlinment detected, inlined is not in the locals

cleanup, docstring update

fix test broken by addition of new entity in test schema