Borg backup wrapper update, config update

Add a .gitignore for all other files that can appear in this
folder
(.config, .cache, settings files, etc)
Add backward compability check for file backup to
not auto add -file for
the file module unless flag is set
(FILE_REPOSITORY_COMPATIBLE)

borg.backup.file.settings-default

@@ -0,0 +1,9 @@
+# Borg backup wrapper scripts settings: file
+
+# rename to borg.backup.file.settings to use
+
+# set to false to use -file, current default is "true"
+#FILE_REPOSITORY_COMPATIBLE="false"
+
+# override settings in borg.backup.settings with SUB_ prefix
+# valid for BACKUP_FILE, BACKUP_SET, COMPRESSION*, KEEP_*