Steven/bugfix/mgp predict

[stevetorr]

If an MGP is unpickled and used, routines called within the https://github.com/mir-group/flare/blob/development/flare/mgp/cubic_splines_numba.py cubic splines numba file will attempt to use a variable dAd which is only defined when filter_coeffs is called, which seems to only occur during mapping. This adds a call to the calculate_coeffs function when the cubic_splines_numba file is imported, loading it into global memory.

[codecov-commenter]

Codecov Report

Merging #192 into development will increase coverage by 1.95%.
The diff coverage is 2.85%.

@@               Coverage Diff               @@
##           development     #192      +/-   ##
===============================================
+ Coverage        60.89%   62.85%   +1.95%     
===============================================
  Files               44       44              
  Lines             8263     8672     +409     
===============================================
+ Hits              5032     5451     +419     
+ Misses            3231     3221      -10     

Impacted Files	Coverage Δ
flare/env.py	98.42% <ø> (+1.55%)	⬆️
flare/gp.py	89.95% <ø> (-0.03%)	⬇️
flare/mgp/cubic_splines_numba.py	7.04% <2.85%> (-2.14%)	⬇️
flare/mgp/map3b.py	86.66% <0.00%> (+1.84%)	⬆️
flare/mgp/mgp.py	99.43% <0.00%> (+2.58%)	⬆️
flare/parameters.py	84.69% <0.00%> (+2.80%)	⬆️
flare/utils/parameter_helper.py	92.78% <0.00%> (+6.50%)	⬆️

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