[SEC] installer: Handle case when $tikiroot is blank

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50376 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Fivealive theme: menu hover highlight interferred with the theme options styles; they did not support it (TODO: add it to all the theme options and uncomment again?)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50380 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/12.x 50373 to 50380

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@50381 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] revert badly merged file

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@50382 b456876b-0849-0410-b77d-98878d47e9d5
[KIL] obsolete (old) slideshow feature: remove unused files

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50383 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/12.x 50380 to 50383

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@50384 b456876b-0849-0410-b77d-98878d47e9d5