Performance fix

This was already there, but hidden in a comment, so just making sure it's seen:

I've fixed a rather bad performance problem in the later game stages with a 1 line fix that I wouldn't want to withhold from anyone. Add a line saying "leak.clear_ode()" just below line 78 in src/dambuilder/dam.py (in the "if leak.rate

This was already there, but hidden in a comment, so just making sure it's seen:

I've fixed a rather bad performance problem in the later game stages with a 1 line fix that I wouldn't want to withhold from anyone. Add a line saying "leak.clear_ode()" just below line 78 in src/dambuilder/dam.py (in the "if leak.rate