to 100%

* app/display/display-enums.h: Added a GimpZoomFocus enum with
'best guess', 'pointer' or 'image center' values.

* app/display/gimpdisplayshell-scale.[ch]
(gimp_display_shell_scale): Take a GimpZoomFocus parameter and
pass it on to

(gimp_display_shell_scale_get_zoom_focus): which returns the
requested zoom focus point if one was given, else makes a best
guess.

* app/actions/view-commands.c
* app/display/gimpstatusbar.c
* app/display/gimpnavigationeditor.c
* app/display/gimpdisplayshell-callbacks.c
* app/display/gimpdisplayshell-scale-dialog.c: For explicit-zoom
commands like "zoom to 100%", always use the image center as the
zoom focus point. For all other zooming, continue to use the
best-guess method.

* app/display/display-enums.c: Regenerated.

svn path=/trunk/; revision=27104