ENH: use representative_point instead of centroid in Graph plotting

[martinfleis]

Closes #735

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.2%. Comparing base (e82d1be) to head (d486cb4). Report is 9 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/pysal/libpysal/pull/737?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal) ```diff @@ Coverage Diff @@ ## main #737 +/- ## ======================================= + Coverage 83.9% 85.2% +1.3% ======================================= Files 145 145 Lines 15583 15639 +56 ======================================= + Hits 13077 13323 +246 + Misses 2506 2316 -190 ``` | [Files](https://app.codecov.io/gh/pysal/libpysal/pull/737?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal) | Coverage Δ | | |---|---|---| | [libpysal/graph/\_plotting.py](https://app.codecov.io/gh/pysal/libpysal/pull/737?src=pr&el=tree&filepath=libpysal%2Fgraph%2F_plotting.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal#diff-bGlicHlzYWwvZ3JhcGgvX3Bsb3R0aW5nLnB5) | `92.9% <100.0%> (ø)` | | | [libpysal/graph/tests/test\_plotting.py](https://app.codecov.io/gh/pysal/libpysal/pull/737?src=pr&el=tree&filepath=libpysal%2Fgraph%2Ftests%2Ftest_plotting.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal#diff-bGlicHlzYWwvZ3JhcGgvdGVzdHMvdGVzdF9wbG90dGluZy5weQ==) | `100.0% <100.0%> (ø)` | | ... and [4 files with indirect coverage changes](https://app.codecov.io/gh/pysal/libpysal/pull/737/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal)