* SourceSetting.cc (SourceSetting::SourceSetting): Restore proper remembrane of

* SourceSetting.cc (SourceSetting::SourceSetting): Restore proper remembrane of
last source setting.
* choose.cc (ChooserPage::ChooserPage): Potentially retrieve dialog placement
info.
(ChooserPage::~ChooserPage): Save geometry settings if the user moved or
resized the page.
(ChooserPage::PlaceDialog): Rename from MaximizeDialog.  Accommodate changed
user placement settings.
(ChooserPage::OnActivate): MaximizeDialog -> PlaceDialog.
(ChooserPage::OnNext): Ditto.
* choose.h (ChooserPage::~ChooserPage): Define.
(ChooserPage::cmd_show): Delete.
(ChooserPage::saved_geom): New field.
(ChooserPage::window_placement): Ditto.
(ChooserPage::pre_chooser_placement): Ditto.
(ChooserPage::PlaceDialog): Rename from MaximizeDialog.