graph drawing tool

lots more tests

I've been adding diligently to manual_tests but not actually performing any manual tests before releases. They were just a todo list of automated tests to write, and long out of date. Now the list is up to date and much shorter.

Created by  Kartik K. Agaram  on June 14, 2022
DSLD74DK3P6J2VAFCYF5BGTHZ637QTW3PDHOUHFACDZU66YNM3IAC
Change contents