Added new method for compose-space on labelled-gadget to use space needed by label.
Added new method for compose-space on labelled-gadget to use space
needed by label.

Replaces subclass ordering of push-button, toggle-button, menu-button,
slider-gadget, so that labelled-gadget-mixin is first, giving a
default method for compose-space.

Added method for compose-space on text-field-pane.

Replaced method for compute-space on text-editor-pane by method for
compose-space.

onixie/mcclim,swflint/McCLIM,slyrus/mcclim,swflint/McCLIM,antifuchs/mcclim,antifuchs/mcclim,onixie/mcclim,slyrus/mcclim,onixie/mcclim,swflint/McCLIM