Accumulators not reset for inactive points

If a point (patch, column, etc.) is inactive when a reset is requested for a `timeavg` or `runaccum` accumulator type (`accumulMod`), it will not be reset.

I think this is not an issue with the code as-is. Accumulator values seem to only ever be reset at the beginning of the year, which is also the only time that patch activation/deactivation is allowed. However, future code might not make this assumption.