Graph adjacency matrix buttons are extra wide #294
Description
The button width for adjacency matrix buttons seems excessive.
Running this command line:
python3 Graph.py -B Mf Ms Ml Re Be Md Rd Fl Pp Pl Ho Bb Mf-Md Ms-Md Ml-Md Be-Md Re-Be Md-Rd Rd-Fl Pp-Pl Pl-Bb Ho-Bb Fl-Pl produces:
Note how columns without any 1's in the button labels are narrower. And none of the columns are as narrow as the row labels.
Also when a cell is highlighted with a red border (when its being tested by the running operation) the border width seems too large.
This may be related to the newer version of tkinter that came with my Python installation.