Sms auto-reply on rutx50

Ok, I solved one of the two issues. After some debugging I found an environment variable called $SMS_FROM so this solved who I got the sms from.

@Marijus, but I still need to get rid of the automatic status message that is being added to the output.

It would be nice to have the following variables at hand in the script: $SMS_TEXT, $SMS_TIME, $SMS_DATE, $SMS_INDEX.

In a future update it would be nice to being able to point directly to a script instead of having to call a script from a script.

It would also be nice being able to duplicate an existing rules and similar, not restricted to sms only.