submitOar     : fix bug for keep trace of jobids in arrays.txt file.
gtOarGetStats : add check on 'vars' argument from possible variables from oarstat

Signed-off-by: Laura Nervo <laura.nervo@esrf.fr>

git-svn-id: https://svn.code.sf.net/p/dct/code/trunk@471 4c865b51-4357-4376-afb4-474e03ccb993