libkipi : new method deprecated.

Uopdate list of attributes usable between plugins and host application
Note : do not use KIPI::ImageInfo class directly in plugins but wrapper class KIPIPlugins::KPImageInfo wrapper instead,
to preserve binary compatibility in libkipi. KPImageInfo can be extended as we want without to touch libkipi...
CCMAIL: digikam-devel@kde.org
CCMAIL: kde-imaging@kde.org