delete experiment

Delte should test first if the folder can be deleted (no permission denied). After delete from database.

The following current behaviour is wrong:

dmanubens@odin~ /cfu/autosubmit~$ autosubmit delete test0004
Do you want to delete test0004 ? [y/n]
y
Removing experiment directory...
[WARNING] Can not delete experiment folder: [Errno 13] Permission denied: '/cfu/autosubmit/test0004/conf/jobs_test0004.conf'
Deleting experiment from database...
Experiment test0004 deleted