Refactor of PyBaMM.jl Julia Generation Code

[aabills]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• [x] New feature (non-breaking change which adds functionality)
• [ ] Optimization (back-end change that speeds up the code)
• [ ] Bug fix (non-breaking change which fixes an issue)

Key checklist:

• [ ] No style issues: $ flake8
• [ ] All tests pass: $ python run-tests.py --unit
• [ ] The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• [ ] Code is commented, particularly in hard-to-understand areas
• [ ] Tests added that prove fix is effective or that feature works

[codecov[bot]]

Codecov Report

Base: 99.66% // Head: 99.43% // Decreases project coverage by -0.23% :warning:

Coverage data is based on head (1cfa50b) compared to base (c89445e). Patch coverage: 93.56% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2363      +/-   ##
===========================================
- Coverage    99.66%   99.43%   -0.24%     
===========================================
  Files          269      269              
  Lines        20206    20415     +209     
===========================================
+ Hits         20139    20300     +161     
- Misses          67      115      +48     

Impacted Files	Coverage Δ
...ybamm/expression_tree/operations/evaluate_julia.py	93.46% <93.43%> (-6.54%)	:arrow_down:
pybamm/models/base_model.py	98.56% <100.00%> (+<0.01%)	:arrow_up:
pybamm/simulation.py	99.77% <0.00%> (-0.23%)	:arrow_down:
pybamm/discretisations/discretisation.py	99.79% <0.00%> (-0.02%)	:arrow_down:
pybamm/util.py	100.00% <0.00%> (ø)

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[valentinsulzer]

why closed?

[aabills]

making changes, didn't want to keep testing while I do it. Will reopen at some point