Reorging tests
Making agentsets of patches sortable
Fixing some list-sorting language tests
the real Vants works now

(removed the old Tortoise-only version from the models repo)
make TestModels support overriding dimensions

the old method of using `resize-world` to override was
unsatisfactory because the full-size world would get created
before we had a chance to override it, which could be very slow
for very large worlds (e.g. CA1D Benchmark)
add support for _clearturtles and _clearpatches
CA1D Benchmark crosses the finish line
Merge pull request #84 from NetLogo/sortable-lists

Sortable lists