include "snap boreholes to TINs" feature in GMS

[Todd Wood 7]

A user would like to be able to snap boreholes to TINs representing the top and bottom elevations, similar to how you can snap cross sections to TINs using the "Boreholes | Advanced | Snap Cross Sections to TIN".

[Alan Lemon 3]

This was implemented in version 9.1. http://xmswiki.com/xms/GMS:What%27s_New_in_GMS_9.1