There is a condition inside idfilter() function that helps Apache on Windows to properly handle colon as a namespace separator by replacing it with semicolon. However, this is not necessary on Microsoft IIS server so the condition was improved.

FS#2700)

Note: These changes don't work yet. The cookie is not set and deletes the old
one.

fix for FS#2676, inserting zero length spaces into long sequences of non-breaking characters in diffs

This should make migrating from MediaWiki a bit easier.

The new deletePageNoLock method is used by renamePage and avoids that
the index needs to be unlocked and locked again for deleting the page.