lalinference: mark as version 1.3.1.1
top-level: mark as version 6.23.1
moved ComputeSkyBinary.[ch] into attic

   - obsolete, unused code
   - passes 'make distcheck'
   - refs #20
moved StackSlide subdir into attic

   - obsolete, unused and unmaintained LAL-code (not currently part of the main build)
   - refs #20
moved Calibrate[1800|60s]SFTs.c into attic

   - obsolete, unused and unmaintained LAL code
   - refs #20
lalapps/pulsar: moved obsolete PSD codes into attic

   - psd.[ch], FreqAverager[_v2].c: obsolete, unused and unmaintained
     LAL codes
   - obsoleted by ComputePSD
   - refs #20