Merged several modifications from master-branch.
Disabled the ChibiOS thread registry API.Code that required the thread registry before could be adapted to use the thread hierarchy instead.
Fixed a common typo in several comments.
FIX: _numActiveThreads counted finalized threads
timer and periodic timer have been unified in a single functional unit: timer.
The resulting timer object is slightly larger than one-shot timers have been, but much smaller than periodic timers.Size of resulting binary has been slightly decreased as well.
Calculation of stack utilization revised
Shell: fixed a bug where autocompletion behaved incorrectly
Slight enhancements to cpu load measurement
dramatically lowered worst critical zone in AMiRo-OS
Introduced a new system shell command 'module:spuload' to read out CPU load
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