allow XLALClobberDebugLevel() to be used from SWIG

- simply moved prototype from C-file into header-file
- useful for debugging, in order to allow changing lalDebugLevel from
  the swig interface without having to restart the interpreter
cbcBayesPPAnalysis.py: Fix indentation
Fix indentation in cbcBaysPPAnalysis.py
cbcBayesPPAnalysis.py: Remove obsolete option
lalpulsar: reduce amount of INFO output in CWMakeFakeData and LFTandTSutils