Ast generation speedup

[benjamin-gibson]

There was a specific for loop in pick_models_toothpick_style() that took forever looping through each SED to choose which ones to keep as artificial stars. The new code instead loops through filters and un-full bins and vectorizes over the SEDs. This is significantly faster -- new artificial stars can be generated in seconds.

I also implemented the use of the mag_limits() function for pick_models_toothpick_style(), so now users can set the keywords ast_fluxbin_maglimits and ast_filters_inside_maglimits in their beast_settings.txt file (example below). This allows users to only get back model SEDs that have fluxes within some magnitude range (ast_fluxbin_maglimits) for a critical number of filters (ast_filters_inside_maglimits).

Example:
# ast_fluxbin_maglimits : dictionary (optional)
#   If supplied, these magnitude limits will be applied to the SED model grids
#   when selecting additional ASTs. This is a dictionary that includes
#   information for the magnitude cuts as a function of the filters included.
# ast_fluxbin_maglimits = None
ast_fluxbin_maglimits = {"HST_ACS_WFC_F555W": [16,30], "HST_ACS_WFC_F814W": [16,30], "HST_WFC3_F275W": [16,30], "HST_WFC3_F336W": [16,30], "HST_WFC3_F438W": [16,30], "HST_WFC3_F555W": [16,30], "HST_WFC3_F814W": [16,30], "JWST_NIRCAM_F200W": [16,30]}

# ast_filters_inside_maglimits : integer
# Number of filters that must be within the magnitude limits
# for an AST to be included in the list (Default = 3)
ast_filters_inside_maglimits = 5

[karllark]

Please fix the codestyle errors. I often just run the "black" auto-formatter to avoid any codestyle issues like this.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 2.70270% with 36 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 40.46%. Comparing base (b799489) to head (dd067c1).

Files with missing lines	Patch %	Lines
beast/observationmodel/ast/make_ast_input_list.py	2.85%	34 Missing :warning:
beast/tools/run/make_ast_inputs.py	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #847      +/-   ##
==========================================
- Coverage   40.55%   40.46%   -0.10%     
==========================================
  Files         107      107              
  Lines       10320    10346      +26     
==========================================
+ Hits         4185     4186       +1     
- Misses       6135     6160      +25     

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