Item12475: Simplify @INC

Update the docs to go along with the setlib.cfg changes.

Update the release notes.

git-svn-id: http://svn.foswiki.org/trunk@17670 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item9693: removing dangling link from sidebar



git-svn-id: http://svn.foswiki.org/trunk@17671 0b4bb1d4-4e5a-0410-9cc4-b2b747904278