Handle query format field width centrally in formatValue()

- Eliminate the quirky formatPrefix buffer argument to formatter functions,
  deal with the width at formatValue() if specified.
- This not only simplifies things a great deal, removes a nasty
  unbounded buffer writing from formatter functions and speeds things
  up somewhat by removing extra rasprintf()'s in many cases, it also
  gives us width formatting of everything including "error messages"
  like "(none)" and "(not a number)" which previously got dumped without
  any formatting.
- The cost of this is the loss of zero padding support for numeric
  data but that's hardly a big deal.

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