Change part order as a last resort

[reluttrull]

If all other attempts to fit into a give number of rows have failed, try changing the part order.

E.g.:
Assignments = 1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 5, 5, 6, 6, 6, 6
Rows = 3
Max width = 6

Seating:
1 1 3 3 3 3
2 2 2 5 5 5
4 4 6 6 6 6

[reluttrull]

This is partially resolved in how overflows are fixed now. Result (not ideal) will be:

1 1 2 2 2 6
3 3 3 3 4 4
5 5 5 6 6 6

Probably need a step that looks for instances where players on the same part are separated, and performs swaps until all parts are "together" (ie. separated by only one row or one column).