Split of MetaModel into MetaModel and PCE/GPE classes

Split the MetaModel class into a parent and child classes. The parent class contains all needed properties and functions so that the rest of the package works, while the child classes contain surrogate-type specific functionalities.

added Meta-modeling Restructuring Test labels

requested review from @mariafer.morales

assigned to @RKohlhaas

To merge this we should finish the following:

• Test that the model-comparison runs through
• Add unit tests for the GPE, goal is >60% coverage
• Test sequential design with GPE
• Test sequential design with PCE
• Use the new PCE class in the examples instead of the MetaModel class
• Update the diagrams in the docs
• Update the code descriptions in the docs
• Remove the gaussian_process_emulator from supplementary.py and rerun the tests

added 1 commit

• a0da2407 - [docs] New UML diagram for surrogate class structure

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added 1 commit

• 8dd9477f - [docs] Started update to PCE/GPE classes

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added 3 commits

• b4f565b1 - changed MetaModel to PCE
• 96e08763 - added system settings for MacOS
• 48fe8e47 - Merge branch 'restruct/surrogate_template' of...

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added 3 commits

• 905217a8 - fixed bug, saved BME value
• 1394afb3 - added start_engine for seq design
• 73d77a96 - Merge branch 'restruct/surrogate_template' of...

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added 2 commits

• 7d4dae62 - sinusoidal function as a new example
• 37ddba87 - Merge branch 'examples/SinusoidalFunction' into 'restruct/surrogate_template'

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added 2 commits

• c34fbe6d - add sinusoidal function
• 04c296c3 - Merge branch 'examples/SinusoidalFunction' into 'restruct/surrogate_template'

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added 2 commits

• 8bcc4a0c - user input changes
• d9dd3260 - Merge branch 'restruct/surrogate_template' of...

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added 1 commit

• 19182e06 - user input changes

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added 1 commit

• 00a5afc2 - changed MetaModel to PCE in examples

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added 1 commit

• ace30b4a - [gpe] Remove unused old gaussian_process_emulator function

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added 1 commit

• 4bf78b3b - [fix] Use training samples reurned from the model

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added 2 commits

• d7f46dee - Changed docstrings, n_restarts variable
• c8997e0d - Merge branch 'restruct/surrogate_template' of...

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added 1 commit

• 0f40c1a8 - [docs] Final changes of the class diagrams and class names in the docs

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added 1 commit

• 8cec134a - added test for GPESkl (coverage 29%)

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added 1 commit

• 1c82e43f - test_fit_parallel

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mentioned in commit 396895f0