leave an empty/corrupt main file if we crash during saving
- started adding Postscript output
- renamed "Save as KiCad" to "Write KiCad"
- switched from "manual" menu bar creation to GtkItemFactory
git-svn-id: http://svn.openmoko.org/trunk/eda/fped@5417 99fdad57-331a-0410-800a-d7fa5415bdb3