adding 2 new variables to TSM
* TSM_ARCHIVE_MGMT_CLASS which defines a backup class to use with TSM
* TSM_RM_ISOFILE which triggers (if set to y) to remove the original iso file from local system once the ISO image has been tranferred to TSM successfully
* default.conf: GRUB_RESCUE=n instead of y before (to save space under /boot)