The bookmarks panel can display a tree of bookmarks and allows
editing and deleting of bookmarks via a context menu.
The XBEL implementation has been altered to work with a
reference count model to allow panels to update on their own.
If the window is maximized the effective size matches the available
screen size, thus after restarting the browser we end up with a
window the size of the screen in normal state.
It is often useful to have multiple browser windows opening at once,
and having them open on top of each other is counterproductive.
Most window managers, on the other hand, have code to decide where
to place a window so that it is accessible by the user.
The statusbar and progressbar respectively should not
be updated too generously. Optimizing the status updates
reduces flickering of entries remarkably.
The code was not updated along with other changes in the past.
It was cleaned up to work properly again, particularly the percentage
is displayed in text form again.
