New package: sylpheed

[Michael Schwendt <bugs michael gmx net>]

Sylpheed, dropped from Core, imported and edited slightly, is ready for
comments.

It's another package where desktop file was named redhat-%{name}.desktop
and if changed to fedora-%{name}.desktop, it would break the desktop links
for any user. Personally, I'd prefer if such breakage could be avoided.
Unless there is a policy. :(