Borg Backup wrapper Version 4.0 update

* file backup borg folder has now -file name inside. Old folder must be
  manuall renamed
* All modules have the module id name as prefix in the backup set,
  _borg_backup_set_prefix_cleanup.sh needs to be run before to clean up
  all names or prune will not correctly delete old entries

New -T for one time target backup with custom prefix to have backups
outside the automated prune. -D option to delete this set

Add borg 1.2 support for compact which is called after delete and prune
to actually clean up the space.

-b borg executable and BORG_EXECUTEABLE override setting if borg is not
in path or another borg executable should be used

borg.backup.file.settings-default

@@ -2,8 +2,8 @@
 
 # rename to borg.backup.file.settings to use
 
-# set to false to use -file, current default is "true"
-#FILE_REPOSITORY_COMPATIBLE="false"
+# set to true to use old setting without -file in backup name
+#FILE_REPOSITORY_COMPATIBLE="true"
 
 # override settings in borg.backup.settings with SUB_ prefix
 # valid for BACKUP_FILE, BACKUP_SET, COMPRESSION*, KEEP_*