A wei must not print as 1E-18: fixed-point money formatting

<p>A money type that is exact in memory and lossy the moment it becomes text has not removed the rounding bug. It moved the bug to the last line of the call stack. Python's <code>Decimal</code> renders a single wei as <code>1E-18</code>, a hand-rolled <code>units / 10**8</code> renders one satoshi as <code>1e-08</code>, and a <code>round(amount, 2)</code> dropped into a template picks a rounding m

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