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allow the new username to be populated by subpage

Authored by MC8.

Description

allow the new username to be populated by subpage

Previously, [[Special:RenameUser/Foo]] prefilled the form with "Foo"
as the old username. This commit adds similar functionality for the
new username, so that [[Special:RenameUser/Foo/Bar]] will prefill
the form so that "Foo" is renamed to "Bar".

Change-Id: I5846e8548d8a10f3363ef45e00e9a791dd84063c

Details