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Use defaultUser.png instead of defaultUser.gif

Indeed, defaultUser.gif is in a deprecated skins folder (Products/CMFPlone/
skins/plone_deprecated/defaultUser.gif) and not defaultUser.png
(Products/CMFPlone/skins/plone_images/defaultUser.png).
Test is also updated.

Conflicts:
	CHANGES.rst
tune packaging with check-manifest
Preparing release 2.2.12
Back to development: 2.2.13