Change way that shared expenses are calculated

The way that shared expenses are recorded and calculated has changed.
Now instead of specifying how among many people the expense was divided,
the names of the persons are specified. You can also specified expenses
that are "owed", or in other words, things that you paid for other
people, or maybe loans you made.

Don't know why I didn't think of this system before. Sometimes good
ideas just come at the least expected times.

Also removed some unused fields.

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