fix broken links in User Manual
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
make `file-open` dictionary entry mention multiple open files
Merge remote-tracking branch 'origin/5.0.x'

Conflicts:
	project/proguard/lite.txt
	src/test/org/nlogo/headless/TestErrorMessages.scala
Merge remote-tracking branch 'origin/master' into core

Conflicts:
	dist/index.html
	docs/3d.html
	docs/dictionary.html
	docs/requirements.html