Updating submodule ref
remove repeated word in doc
user manual tweak (recommended tick-based updates even more heavily)
latest models to get release script fix
remove debugging output
beef up StructureParserTests with some passing tests

adding them since they're going to fail once merged to master;
it's #414
fix broken links in User Manual
add passing ExpressionParser test showing existence of issue #417

I'll fix the bug and update the test case in a subsequent commit
fix ExpressionParser bug -- fixes #417
update comment in headless.Dump
update comment
remove debugging output
as far as we know, NetLogo works on Windows 8
slight wording change on downloads page
Keeping around some stuff in 'NetLogoLite' for the Web Image extension
Merge branch 'topic' into 5.0.x
remove nulling out
make `file-open` dictionary entry mention multiple open files
use latest models
Merge pull request #418 from NetLogo/issue-417

fixes #417