* ui/mainwindow.glade: Again remove the tearoff menus and the
menubar and toolbar handle boxes.  This was just superfluous UI
clutter not actually used by anyone.
(button_folder): Get rid of the custom button that used to fire
up the file chooser dialog, plus the accompanying text entry for
display and editing of the folder name.  Replace this old cruft
with a fresh and crisp GtkFileChooserButton plus a label.  Yay!
(combo_pattern_entry): Reactivate commented-out markup that sets
a tooltip on the internal GtkEntry child of combo_pattern.  As
this finally supported by libglade it is no longer necessary to
hack around the limitation in code.

* src/mainwindow.{cc,h} (MainWindow): Adapt the implementation
to work with the changed UI layout.  Change the folder selection
handling as necessary.
(MainWindow::load_xml): Remove the tooltip hack for the pattern
entry, since libglade now allows for this in the glade file.
(MainWindow::get_folder_fullname): Remove now unused method.
(MainWindow::on_select_folder): Likewise.

svn path=/trunk/; revision=607