Outline median path routine
Add correct computation of barycentric velocity (Agrees with IRAF rvcorr!)
Update install script
readability
Add functions color_z_plot and avgstd
Changes to ianc spec.py
Merge branch 'develop'

* develop:
  Changes to ianc spec.py
  Add functions color_z_plot and avgstd
  readability
  Update install script
  Add correct computation of barycentric velocity (Agrees with IRAF rvcorr!)
  Outline median path routine