fix description for max_wall_clock_time, see https://github.com/dmwm/CRAB2/issues/930
improve max_wall_clock_time description, see https://github.com/dmwm/CRAB2/issues/930
do not add CMSSW version ot gLite JDL: https://github.com/dmwm/CRAB2/issues/936
do not use crablib https://github.com/dmwm/CRAB2/issues/938
Merge pull request #939 from belforte/master

pull