* app/confirm.[ch] : new function confirm_export_size() which let's the
	user confirm an unusal diagram size
	* app/Makefile.am app/makefile.msc po/POTFILES.in : add new files
	* app/commands.c app/filedlg.c : use it before export and print to avoid
	possibly unintended numbers of pages printed or memory used for export.
	(Bug #540477, Martin Wegner)

	app/preferences.[ch] : removed obsolete print preference


svn path=/trunk/; revision=4229