Revert "Clarification on the trailing slash in siteUrl"

This reverts commit 735f17268549fd1a1bfc5c8a1bbd421467b76602.

We're already alerting people to be mindful of trailing slashes in the Note.
UserGroupModel
Added some missing properties and methods to UserModel
Documented the simple output of model variables
Documented SectionModel
Fixed a couple navs
Fix a typo and put in alphabetical order.
hookRegisterCpRoutes => registerCpRoutes and no need to escape forward slashes in route regex.
'auto', not ASCII.
Not needed.
Rewrote parts of the Relations page to include Tags, and removed the getChildren() and getParents() functions since they're lame
Cleaned up the Search page, and added the '::' syntax
Node is deprecated.
Node is deprecated.
Add this back.
activate account config var cleanup
Merge branch 'refs/heads/master' into 1.2