[optimizations] remove unnecessary code

Remove the unnecessary loops to translate binary vectors to arrays.

Make some shortcuts in the resource_tree algorithm.
[oarsub] add filter on notifications

It is possible to specify which TAGs must be triggered::

   oarsub --notify "[END,ERROR]mail:name@domain.com" -I
[drawgantt-svg] activate by default drain feature
[oaradmissionrules] new script, to replace oaradmin ru