Refactored forum and added tagging

Remember to install the latest table from the bottom of the
setuptables.sql file (in the uForum project).
Merge branch 'master' into Forum-Refactor-And-Tagging

Conflicts:
	OurUmbraco.Site/config/applications.config
	OurUmbraco.Site/config/trees.config
	OurUmbraco.Site/xslt/forum-commentsList.xslt