ENH: Compare analysis params when loading from cache

[scottclowe]

The load method now refuses to load if the analysis parameters in the cache do not match the parameters of the Experiment instance.

The method can be refined in future efforts, but I think it is advantageous to include as-is and then improve from there.

• The current settings are possibly too aggressive. An error is thrown if load tries to load a cache which is not valid. Because load is called by __init__ if the cache already exists, this means an error is immediately thrown if an Experiment instance is created with different parameters to the existing cache.
• We currently reject caches which have parameters that differ from unset default parameters.

[codecov[bot]]

Codecov Report

Merging #245 (4643ff4) into master (862a251) will increase coverage by 0.25%. The diff coverage is 97.77%.

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
+ Coverage   93.88%   94.13%   +0.25%     
==========================================
  Files           8        8              
  Lines        1095     1176      +81     
  Branches      254      288      +34     
==========================================
+ Hits         1028     1107      +79     
- Misses         34       35       +1     
- Partials       33       34       +1     

Flag	Coverage Δ
nbsmoke	60.28% <54.44%> (-0.36%)	:arrow_down:
unittests	93.87% <97.77%> (+0.27%)	:arrow_up:

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Impacted Files	Coverage Δ
fissa/core.py	96.72% <97.77%> (+0.13%)	:arrow_up:

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