Modem fixes

Rerwin has tested 4.1alpha5 and applied some fixes for the modem scripts.
I changed the goal-posts with 4.1, removing auto-probing of serial modems, and rerwin has very patiently examined the latests scripts and tested on various modems, and devised new patches. In particular, a problem with the 'modemprobe' script has been solved.

Tags: puppy