refactoring condition
renaming variable
fixed problem in cancel job where JobId, instead of the JobBatchId, is sent to the batch scheduler
refactoring and added logging msg
updated EMF model for improving cancel multiple jobs. + misc fixes
removed redondant exception message
used empty() instead of size()==0
refactorung logging
refactoring: renamed variables...
refactoring umsserver: *changed existuserId to  getNumUserId to allow to have the reference of the user in the database
added a logging macro in utilServer.cpp
renamed variable in submit_job.cpp
Updated/improved cancel job
 * machine ID is not longer required
 * several job can be now cancelled at once according to the options provides
   regarding the user or the target machines
 * see the ticket #414, #443 and the help for more details