adding normalization parameter to the model
Merge branch 'master' into norm
added additional normalization parameter; currently includes prior/limit
adding normalization to the parameter list

In full_page especially, but really everywhere, the addition
is still a bit kludgy, like adding ln(s) was.  There's got to
be a better way to add additional parameters and let the list
propagate through the code
check the sum of mod_flux.value, not mod_flux, though I don't understand why...
added snap function to make_model; split normalize into its own function

Added retrieve_model function that finds the nearest model (that
functionality isn't quite built yet) and then returns it, rather than
interpolating over the parameters.

Normalizing the model is now its own function, called by interp_models
and retrieve_model, rather than part of interp_models.
added normalization parameter to plotting

For the full page plot and replot module, included the normalization
parameter (still in a kludgy way I'm unhappy with)

Also stopped plotting the "realistic" models in the replot module
fixed find_nearest
using codes from summer REU to access med-res data not in the database
commented out acor line; it was throwing an error for some reason
Add new function to smooth a single model, option in smooth_grid

smooth_grid now takes an argument "variable" that determines whether
the models need resolution-dependent smoothing (i.e. for SpeX) or
can just be smoothed to a single resolution across the grid.
There's a new function, smooth_model, that smooths a single model
to one resolution.
smooth Marley models for NIRSPEC N3 (Jband)
option to select a specific observation date
smooth for Spex Cross-Dispersed
pull all spectra with SpeX X-Disp and create batchfiles for them
test bdmcmc on med-res data
make batch files for dusty
adjust Marley model grid and units
git ignore file
for loop was set up wrong