imageTrace.make and imageTrace.makeAndExpand checked their own keys, but
not the keys inside `params`. A misspelled setting such as `colours` was
dropped, and the trace ran with the preset's value and no error.
A key inside `params` that is not a trace setting is now an error that
names the nearest setting, as for a command's own keys. Errors from
imageTrace.makeAndExpand, including those for `enhanced` and a missing
swatch library, name that command instead of imageTrace.make.
dotCooCoo
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