Optimising incomplete - pattern limit reached

May occur when optimising.

There is an upper limit to the number of different patterns the optimiser can produce. This error is shown when the limit is reached.

The maximum number of patterns for saw optimisations is 5000

The maximum number of patterns for nesting optimisations is 2000

These are very large numbers of patterns for a single run - so it is worth investigating the data and see if it can be split up.