bug fix: overwriting the TA0R causes missing TIMER0_A1_VECTOR interrupts
bug fix: wrong timer register was written that caused occasional stop of RTOS tick generation / thread switching
Merge branch 'master' of git@github.com:grueni75/MetaWatch-Gen2.git
Merge pull request #35 from grueni75/master

Fixes for bugs that were causing lost timer interrupts and missing thread context switching