Walls: #UNITS TYPEAB directive clears previous INCA or INCAB value.

[Joe Walko]

Walls #UNITS TYPEAB causes cavern to clear either INCA or INCAB (not sure which), resulting in an increase in the compass fs/bs "disagree" amount equal to the magnitude of INCA or INCAB.

This based on logged 'warnings'; am not sure if issue propagates downstream, or if scope is limited to 'warnings' section.

See attached SRV file; Run cavern with the #UNITS TYPEAB directive 'commented' vs 'uncommented' to see the effect.

[Joe Walko]

Walls data for #UNITS TYPEAB directive and INCA/INCAB