[FIX] Changes added to fix parsing issue in action_calender module Ref: http://dev.tiki.org/item4986

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48759 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Avoid invalid index errors

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48760 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Changes added to detect when two wiki pages have the same alias  Ref: http://dev.tiki.org/item4250

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48761 b456876b-0849-0410-b77d-98878d47e9d5
Removed unintended code changes introduced in 48721

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48762 b456876b-0849-0410-b77d-98878d47e9d5