allow config of cherrypy # threads via local_settings
fixing bug on windows script.
Slight tweaks to spacing on knowledge map topic pages.
Prevent central server and distributed server cookies from interfering.
Merge pull request #537 from jamalex/prevent_cookie_overlap

Prevent central server and distributed server cookies from interfering.
Merge pull request #536 from jamalex/collapse_exercise_layouts

Slight tweaks to spacing on knowledge map topic pages.
Merge pull request #535 from bcipolli/thread_count

allow config of cherrypy # threads via local_settings