Broadcast plugin
- Added file groupings by number of files: if not, then it's possible to
create a Task with so many files that the TaskInputs table, InputVector
field, gets too large and gets chopped at a random location (64k
characters). Now assume default grouping of 1.
- Make the TargetSE always defined, even if the SourceSE list contains
it: after all, why can't we copy the files to another SE of the same
region.
Merge pull request #1225 from sposs/TSBroadcastPlugin

CHANGE: Broadcast plugin