Item11737: Replace System with %SYSTEMWEB%

git-svn-id: http://svn.foswiki.org/trunk/core@17805 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item11737: Replace Sandbox with %SANDBOXWEB%

git-svn-id: http://svn.foswiki.org/trunk/core@17806 0b4bb1d4-4e5a-0410-9cc4-b2b747904278