[api] fix diff support for accepted requests where source got removed

Conflicts:
	src/api/app/controllers/request_controller.rb
[api] use XML parser objects instead of request database model
[dist] initial version of release notes
[api] fix initial database setup on appliances
[webui] fix underscores in code listings

See https://github.com/openSUSE/open-build-service/pull/52 for details
[backend] add "hostarch" to buildinfo if present in buildconfig
[api] Fedora 15 is EOL
[webui] disable job box
[webui] do not expose other users email adress in URL when user is not logged in
[api] add openSUSE 12.2 and remove soon to be EOL openSUSE 11.4 from default targets
[backend] also omit packages excluded from project links in :depends

Conflicts:
	src/backend/bs_sched
[dist] sysconfig/proxy does not always exist
[backend] make sourcecopy bump vrev if 'withvrev' is given
2.3.4 ReleaseNotes
[api] package meta of package copy command is not copying relationships and devel definitions anymore
update 2.3.4 releasenotes
[dist] update spec file template
[api] add 12.2:ARM distro
- ReleaseNotes: mention cross build chroot initialization fix
[backend] fix prp access logic