+* Added a new hook, "WhatLinksHereProps", to allow extensions to annotate
+ WhatLinksHere entries.
+* HTMLForm's HTMLTextField now supports the 'url' type.
+* HTMLForm fields may now be dynamically hidden based on the values of other
+ fields in the form.
+* HTMLForm now supports multiple copies of an input field or set of input
+ fields, e.g. the form may request "one or more usernames" without having to
+ have the user enter delimited list of names into a text field.