show accesskey also on actionlink title and add accesskey parameter only if a key is defined (FS#2226)

unset does not reset the Array's internal pointer which messes up later
calls. array_pop is still much faster than array_splice

Looks like a for loop is faster than array_splice

The file contained a few DOS lineendings and trailing spaces

Turned out a test wasn't really testing what it should have been testing
and thus did hide a bug. Still puzzles me why it still worked some
times.
This patch also sets the default iteration count for bmd5 and pmd5 to 8.

When an overlong edit summary was given for an edit, the resulting
changelog line could be longer than the chunk that is handled in the
changelog reader (8192 bytes) causing the reader to abort the operation.

This meant that old revisions where no longer accessible. This patch
fixes the reader (it continues reading chunks until a full line is
found).

However, limiting the summary makes sense and will be added in another
patch.

This patch applies the correct pagename cleaning to namespaces as well.
Namespaces should follow the same rules as pagenames but due to a bug it
was possible to have namespaces ending in a underscore.

If you used such a namespace it will be inaccessible after applying this
patch. You should rename the namespace directory on the filesystem
(removing the trailing underscore). You old links will then work
automatically again. Rebuilding the search index is recommended.