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ENH: Allow override of order amount rounding. (#1722)

* ENH: Use regular rounding to calculate order amounts.

We previously tried to prevent accidental over-ordering by truncating
orders down unless they were within 1e-4 of the next higher integer.
Unfortunately, this makes it easy for a sell order to be one share short
of the desired position.

Using regular rounding treats both buys and sells in the same way.

* ENH keep non-rounding behavior consistent, but leave code structured to make easier to override

* DOC make round_order public and describe behavior in docstring

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