ILDProductionChainOpt2017.py : Included NbTask options and specify output SE of each applications

Akiya Miyamotorequested to merge
amiyamot/ILCDIRAC:nbtask_and_outse into Rel-v26r0

Add functions to set NbTasks and specify output SE separately. Comments in the code are increased. The script is confirmed to run before sending this merge request.

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