#177 g-stl takes too long

[Lee Butler]

running g-stl on a database with only a single BoT primitive should essentially be a data format conversion operation and fast. No Boolean evaluation should be necessary. The converter seems to spend massive amounts of time doing no file I/O.

for example, run:

g-stl -o bot2.stl bot.g bot.s2

[Lee Butler]

a file with 1 BoT

[Sean Morrison]

Bob just finished implementing a preliminary bot-stl that avoids the boolean processing. It should be available in the next release.