[FIX] "double height with scrollbar" issue in codelisting with CodeMirror

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49633 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] several attempts to fix the BiDi feature (RTL): fix to allow specifying lang of the page content and displaying correct direction of a wiki page content saved in non-RTL language inside a RTL language site, simplification (one dir="rtl" in root html element should be enough to style the rest), fix to prevent columns overlapping in RTL, switch the sides of the columns switchers in RTL (more to come)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49634 b456876b-0849-0410-b77d-98878d47e9d5