More bug fixes

Hi myang,

another set of bug fixes. One memory leak introduced by the latest new features. And two fixes for interoperation with the Android community edition of MWM. The removed GetRtc message resulted in MWM unable to update the time of the watch. And the number of messages that can be tied to the buttons of the watch were too low to handle all features of MWM. The result was that some buttons were not working in some situations.

Bye

Matthias