Added a preliminary support for a manual display widget,
it's a very basic HTML text-browser, so it can have
hyperlinks, images and everything that a 1995 browser
has.
The long term plan is to subsittute this manual by
a more modern 'help' using QGraphicsView, that will
interact on the application level.
See #121
Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>