Dev symbolic

[tobin-ford]

Describe your changes

• symbolic equation solver for simple models.
• notebook tutorial Custom-Functions-Nopython.ipynb

Issue ticket number and link

#49

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist before requesting a review

• I have performed a self-review of my code
• Code changes are covered by tests.
• Code changes have been evaluated for compatibility/integration with Scenario analysis (for future PRs)
• New functions added to init.py
• API.rst is up to date, along with other sphinx docs pages
• What's new changelog has been updated in the docs

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.55319% with 7 lines in your changes missing coverage. Please review.

Project coverage is 64.70%. Comparing base (1b70fbc) to head (5cd650c).

Files	Patch %	Lines
pvdeg/symbolic.py	84.78%	7 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #104      +/-   ##
===============================================
+ Coverage        63.86%   64.70%   +0.83%     
===============================================
  Files               32       34       +2     
  Lines             3119     3213      +94     
===============================================
+ Hits              1992     2079      +87     
- Misses            1127     1134       +7     

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