Various contributions by Jochen

Various contributions by Jochen
# Added new classes for event/run statistics/summary ( as well as
their producer components )
* in BASE :
** AliHLTRunSummary and AliHLTEventSummary as base classes
** added 4 new DataTypes to AliHLTDataTypes for event/run statistics/summary
* in TPCLib
** AliHLTTPCEventStatistics and AliHLTTPCEventStatisticsProducerComponent
** AliHLTTPCRunStatistics and AliHLTTPCRunStatisticsProducerComponent
* in trigger
** AliHLTEventSummary and AliHLTEventSummaryProducerComponent
** AliHLTRunSummary and AliHLTRunSummaryProducerComponent

# Including trigger in doxygen, creation of 3 groups for trigger,
event statistics and homer

# fixed 2 warnings in class trigger/AliHLTTriggerSelectiveReadoutComponent

# Fix of segfault in class BASE/AliHLTHOMERBlockDesc

# Code cleanup in BASE/AliHLTHOMERBlockDesc and BASE/AliHLTHOMERSourceDesc

# Adding all HOMER related classes to doxygen group alihlt_homer

# changed static const to const in AliHLTDataType.h