* src/GNOME_Gnumeric_Component.xml: Add UI for the viewer component.

* src/Makefile.am: Add UI file for the viewer component.

* src/gui-util.c (gnumeric_keyed_dialog): Use
wbcg_set_transient instead of gnumeric_set_transient.

* src/main-component.c (control_activated_cb): New signal handler
to handle component activation/deactivation.
(gnumeric_component_factory): Register activation/deactivation
signal handler

* src/workbook-control-component-priv.h
(struct	_WorkbookControlComponent): Add bcontrol member for the
BonoboControl.

* src/workbook-control-component.c (wbcc_set_transient_for): New
function. Set a dialog transient for the bonobo shell which
contains us.
(bcontrol_get_wbcg): New function. Get the WorkbookControl from
the BonoboControl. This is implemented by means of object data on
the BonoboControl.
(cb_file_summary): New function. Pop up the Properties dialog.
(cb_edit_copy): New function. Copy the selection.
(cb_edit_search): New function. Pop up the search dialog.
(cb_help_about): New function. Pop up the "About Gnumeric" dialog.
(verbs): Add them.
(workbook_control_component_init): Zero the bcontrol field.
(workbook_control_component_ctor_class): Override the wbcg
set_transient method.

* src/workbook-control-gui-priv.h (WorkbookControlGUIClass): Add
set_transient virtual method.

* src/workbook-control-gui.c (WBCG_CLASS, WBCG_VIRTUAL_FULL,
WBGC_VIRTUAL): Define macros, analogous to macros in
workbook-control.c.
(wbcg_set_transient_for): New function. set_transient
implementation for wbcg.
(workbook_setup_sheets): Resize notebook from an idle handler to
work around a display problem in the component. Explain why we had
to do this.
(workbook_control_gui_ctor_class): Add set_transient virtual method.