GP replicate_self fixes

[marpulli]

This fixes #183 (but maybe you want to copy kernels in a different way as discussed yesterday). It also fixes a few other issues with cloning this specific GP module and adds tests

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[marpulli]

This was a bit premature, once #184 is merged in the tests should pass

[codecov-io]

Codecov Report

Merging #185 into develop will decrease coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #185      +/-   ##
===========================================
- Coverage    88.15%   88.09%   -0.06%     
===========================================
  Files           80       80              
  Lines         4085     4108      +23     
  Branches       693      693              
===========================================
+ Hits          3601     3619      +18     
- Misses         310      313       +3     
- Partials       174      176       +2

Impacted Files	Coverage Δ
mxfusion/inference/inference_alg.py	94.73% <100%> (+0.05%)	⬆️
mxfusion/modules/gp_modules/gp_regression.py	94.27% <100%> (-1.85%)	⬇️
mxfusion/modules/module.py	80.92% <100%> (+0.09%)	⬆️

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[meissnereric]

Thanks for the fix Mark.

Is there a reason you only add this for GPRegression and not for SparseGP or SVIGP?

[marpulli]

Laziness mainly. If you don't want to do anything more general (especially for copying kernels?) I can add it to the other GP modules

[marpulli]

Now added fixes + tests for all GP modules