Adding Python iGraph export for CAGs

[pauldhein]

Overview

• Added an export method for CAGs as a .gml file that can be easily loaded into Python iGraph
• Added the script cag_converter.py to allow for existing GrFN JSON files to easily be converted
• Tests (tests/model_assembly/test_conversions.py::test_igraph_conversion()) show an example of how to load a Python iGraph from a .gml file

[codecov[bot]]

Codecov Report

Merging #204 (d2e3cbe) into master (858c981) will increase coverage by 0.34%. The diff coverage is 100.00%.

:exclamation: Current head d2e3cbe differs from pull request most recent head 73fa21b. Consider uploading reports for the commit 73fa21b to get more accurate results

@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
+ Coverage   66.99%   67.34%   +0.34%     
==========================================
  Files          75       75              
  Lines       13829    13838       +9     
==========================================
+ Hits         9265     9319      +54     
+ Misses       4564     4519      -45     

Impacted Files	Coverage Δ
automates/model_assembly/networks.py	82.08% <100.00%> (+6.65%)	:arrow_up:

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