#7 swapping with observable arrays

[Hans Fugal]

This useful idiom doesn't work with recipe.ingredients:
ary[a], ary[b] = ary[b], ary[a]

I've tried working around it but it's a hairy mess. I
think the problem is in the observer that recipe puts
on ingredients, which deletes an ingredient from the
database if it's deleted from the array. I propose we
allow recipe_id in ingredient to be null, and hopefully
that will fix the problem. That probably means a few
other minor changes though...

[Jacob Fugal]

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Fixed and committed (see CVS log comment). I wasn't able to
thoroughly test (yet). Hans will be looking at that and I'll
take a second look when I get to a more amenable environment.