Fix docstring
Add back in timing variables.
Fix some minor bugs in outputs.

* Doc fix in pofd_coverage_getBeam.
* FITS header comment fix in doublebeam.
* simManager and simManagerDouble now output the oversampling
  info as part of the beam information.
* Add pycache to .gitignore
* numberCountsDouble now writes out offsetknots correctly
 (previously it wrote out the sigma knots)