Put in some comments for future structuring
Simplified submit script & made args better

Removed options to resubmit or specify a range.
This script now just submits a whole set of jobs for a dataset.

Also improved argument handling by using getopts.
Now have to use -f flag for dataset folder, but checks for invalid options
and invalid folder.
Fix erroneous space
Fix grep in argument.xml
Make crab command verbose by default
Tidying up a few whitespaces