Dragging Signals and Slots

I connected the events that are triggered from BlockLabel all the way to
the mainwindow. This involved having a second connection between the
blockmanager and the browsermanager. I started working on the
functionality of how to mainwindow handles drag events, but ran into a
problem when adding widgets to the central widget. When the label is
going to be added to the central widget have the initial drag, the
program crashes. I will work this out tomorrow. There might be w better
way of drawing the blocks between widgets that avoids this problem.