exclude 'Link Breeds Example' from checksums
update bench dumps for Fire, FireBig and Life
add an ExpressionParser test case
minor tweak to a prim, for Tortoise's benefit
split Compiler into frontEnd and backEnd

for Tortoise's benefit (Tortoise wants frontEnd only), but it also
improves the clarity of the code
add drawing package to graffle
convert agent.Topology to Scala
remove unused code
minor cleanup: rename a variable
convert agent.Torus to Scala
convert agent.Box to Scala
convert agent.VertCylinder to Scala
convert agent.HorizCylinder to Scala
convert agent.Torus3D to Scala
remove unused code
fix mistake in doc

thank you Nikolaos Bezirgiannis for noticing
remove unused code
remove redundant checks from topology code
make ImportWorld Benchmark threadsafe

preventing intermittent test failures when the model is being run
simultaneously in parallel
update benchmark dump for updated model