MAINZONE SP attribute

[bettinardi]

We have had model fails where the SOABM.ver has the field "SP" in the Mainzone list. We have not yet identified how/when the SP field is generated, but what does seem to be consistent is that if the input has an SP field in Mainzones the ABM pre-processing steps crash. For now I am just capturing this issue. If it happens again I will work to gain more information, like specifically what step in the pre-processor (SOABM.py) is failing. And then we can debug appropriately.