Mesh export problems

 From:  Michael Gibson
2318.4 In reply to 2318.3 
I've been overhauling the mesher quite a bit for this next release. These changes hve been primarily to increase speed of the export meshing, but there are also a few other bug fixes as well.

I'm still working on a couple of those bug fixes and then I'll try some tune-ups to the meshing UI then I'll be able to release a new beta with these improvements.

- Michael