Zabbix settings backup, Readme update, base calls location move

New module for zabbix settings backup based on zabbix-dump

Move the _BORG_CALL and _BORG_PRUNE base calls to functions.check
instead of each module (they are all the same)

Update Readme file

Update default settings and remove KEEP so the original defaults are
used

borg.backup.pgsql.sh

@@ -87,10 +87,6 @@ DB_HOST='local'; # or <host>
 CONN_DB_HOST=''; # -h <host>
 CONN_DB_PORT=''; # -p <port>
 
-# borg call, replace ##...## parts
-_BORG_CALL="borg create ${OPT_REMOTE} -v ${OPT_LIST} ${OPT_PROGRESS} ${OPT_COMPRESSION} -s --stdin-name ##FILENAME## ${REPOSITORY}::##BACKUP_SET## -";
-_BORG_PRUNE="borg prune ${OPT_REMOTE} -v -s --list ${PRUNE_DEBUG} -P ##BACKUP_SET_PREFIX## ${KEEP_OPTIONS[*]} ${REPOSITORY}";
-
 # ALL IN ONE FILE or PER DATABASE FLAG
 if [ ! -z "${DATABASE_FULL_DUMP}" ]; then
 	SCHEMA_ONLY='';