[FIX] memcache: Cache wiki pages using all $_GET params in the key (so different states of page can be cached separately)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46316 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/11.x 46304 to 46316

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@46319 b456876b-0849-0410-b77d-98878d47e9d5