Added features:
- duplicate job with jdl parsing
- download inputsanbox for duplication of input
- site requirements
- delete button for each jdl fields
- on field delete the value will reseted to default value
GUI improvement.
Test
implemented: delete temp folder on back and GUI improvement on jdl
editor
warning solved
pull test
pull test2
checker test
Checker
bug fix
Merge remote-tracking branch 'origin/jobDuplicate'

Conflicts:
	src/main/java/it/italiangrid/portal/dirac/server/Checker.java