Bug fixed in __addSE()
Merge pull request #2088 from atsareg/fix-v6r11

[v6r11] Bug fixed in __addSE()
v6r11p13
Basic bug fixes
Moved tests of the DB to TestDIRAC
minor
Removed unused (and buggy) method
hack alert
comments on unsed methods
just better import
Correct comparisons (see
https://docs.python.org/2/reference/datamodel.html#object.__nonzero__)
For comparisons, comply with DataModel
Added ARC in the killable pilots, and a comment
bug fix: missing parameter
FIX: recover case when a target is not in FTSDB
fix
removed unused old table PrecursorJobs
it's important to respeect the order of deletions
Removed mention of SubJobs table (outdated)
Added JobCommands to the list of tables to delete from