smurf: Added Phase Correction Function debug output

- Also added History log entry for Graham Bell's previous commit:
  smurf: allow phasecorrds to save all debug files
smurf: Remove trailing whitespace

- fts2_validatemirrorpositions.c
- smurf_fts2_phasecorrds.c
smurf: Adjust OPD for each bolometer's measured ZPD position

- Ensure that interpolation onto evenly spaced OPD grid stays within bounds
smurf: Correct wave number trimming