Rewritten mentat-controller.py module to work with new mentat.system library.

The mentat.system library was introduced in previous commit.

etc/bash_mentat-ng-completion

@@ -165,7 +165,7 @@ _mentat_controller_py()
     opts="--regular --shell --debug --verbosity --runlog-dump --action --command --input --interval --config-file --config-dir --log-file --log-level --state-file --runlog-dir --target"
 
     # Command options
-    optscommand="signal-hup signal-kill signal-usr1 signal-usr2 restart start status stop"
+    optscommand="signal-hup signal-kill signal-usr1 signal-usr2 restart start status stop enable disable pidfiles-clean"
 
     # Action options
     optsaction="config-view runlog-dump runlog-view runlogs-dump runlogs-evaluate runlogs-list"