* Fixed export from recipe card to properly handle multiplying
ingredients and following user preferences for changing unit.
* Consolidated preferences dialogs in one dialog with multiple tabs.
* Allow user to save choices about optional ingredients (and to forget
saved settings).
* Added preference to allow user to always include (or always ignore)
ingredients.
* Change order on exports so ingredients precede instructions.
* Properly handle ranges of ingredients throughout Gourmet!
* Moved "Preferences" to "Edit" menu where they are in most applications.
* Fixed window-position-saving so we don't remember size of maximized
position as if they were the window-size coordinates.