event_change_pageby() $name defaults to the current event.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5131 2fea6a4d-a838-0410-917b-93a53c48e9d2
Unnecessary return. A NULL is a NULL.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5132 2fea6a4d-a838-0410-917b-93a53c48e9d2
shift_uploaded_file() returns FALSE on error instead of NULL.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5133 2fea6a4d-a838-0410-917b-93a53c48e9d2
build_file_path() should use DS.

We normalize DS, but not DIRECTORY_SEPERATOR.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5134 2fea6a4d-a838-0410-917b-93a53c48e9d2