Rakefile: enable submitting to IBS

submit to SLES if ENV["LIBYUI_SUBMIT"] says so
Merge remote-tracking branch 'upstream/master'
pull in GPLv3-license, since LGPLv3 is additional rules on top
ChangeLog + VERSION
Merge pull request #80 from besser82/licensing

clarify license
Merge remote-tracking branch 'upstream/master'

Conflicts:
	ChangeLog