gladeui/glade-design-layout.h, gladeui/glade-design-view.h, gladeui/glade-editable.h,
	gladeui/glade-editor-property.h, gladeui/glade-named-icon-chooser-dialog.h,
	gladeui/glade-project.h: Aligning some indentation in headers, adding padding
	to core object classes for possible future expansion.

	Glade core api now officially sealed and ABI stable.