show simple version number as header in login form

so that is it visible when you start up
smarter update window

option to open a provided url per button
also changed new version field to a new name
(this change depends on updater update)
Merged 'develop'.
does that make travis qt4 happy?
put headers where they should belong to
updater option
moved qurl.h back
add option to get notified of beta versions
Merged 'develop'.
This reverts "show simple version number as header in login form" as the header is not longer there

Conflicts:
	huggle/preferences.cpp
	huggle/preferences.ui
i18n
i18n updateform.cpp
Back to old update versions element

unnecessary overhead to maintain compatibility now.
Let's break it for HG 4 :)
Merge pull request #82 from huggle/feature/update

Feature/update