DRY and Scalify _diffuse(/4)
DRY and Scalify _(up/down)hill(/4)

also un-rejigger; these are rarely used primitives with
big bodies, so probably not worth inlining; better to be
able to DRY (which rejiggering forbids)
Merge pull request #582 from NetLogo/dry-up-diffuse-and-uphill

DRY and Scalify _diffuse(/4), _(up/down)hill(/4)
avoid SyntaxJ

this commit gets it out of everywhere except prim.etc.  don't feel
like doing all 200 remaining Scala files in prim.etc right now.
upgrade to ScalaTest 2.1.3
introduce SyntaxOld for use from Scala

with the idea that we will gradually shrink and eventually eliminate
it. having it separate from SyntaxJ will help the compiler help me
do that.
update comment
bye bye SyntaxOld!
fix typo in comment
get rid of __git primitive

it was really only useful in the GUI
get rid of ssh-submodules.sh

doubt this is useful to anyone anymore. all https all the time!
fix regression where in-cone had wrong syntax
remove legacy -nowrap prims
remove __updatemonitor, it was GUI stuff
remove legacy __clear-all-and-reset-ticks prim
Merge pull request #583 from NetLogo/bye-bye-nowrap

remove legacy -nowrap prims
Merge remote-tracking branch 'origin/headless' into scala-2.11