ComputeFstat: removed 'historical' upsampling LALDemod variant

   - refs #543
XLALified 'Demod' ComputeFStat() function

   - refs #543
ComputeFstat_[Demod|Resamp]: removed all traces of RAA approximations

   - simplify code structure to prepare future refactoring
   - refs #543
CmplxAntennaPatternMatrix is the new AntennaPatternMatrix

   - and corrected and improved its doxygen documentation
   - refs #543
Remove RAA options from ComputeFstat API and CFS_v2 command-line

- refs #543