added pokorny 1987 age correction for lens
Merge branch 'master' of https://github.com/bps10/base into HEAD

* 'master' of https://github.com/bps10/base:
  trying to improve speed of cones
  path change to test_spectsens
  added parallelization to cone temp freq
  temporal sens function
  van hateren 2005 hc_widefield mostly working
  more cosmetic changes
  just cosmetic update of cone_arma
  added implementation of Van Hateren 2007 model
  added gaussian blur
  added wavelen to cones, wav2RGB heuristic
  changed strehl ratio
  minor input change in psf
  added cones, change imports
  moved mtf, psf and diff methods here