format: revise numeric handling.

There are a number of issues, such as left adjustment not
working and such. This needs a better treatment from the
requirements level, through to a set of test cases.

* stream.c (max, min): Macros macros added, in their usual
form.
(vformat_num): Implement new rules which suppress the zero and
space characters used in place of a sign if they overflow the
field width.
(formatv): Clamp integer precision field to width - 1 for
integers, for consistency with floating-point handling.
For floating-point values under ~a and ~s, do not force
the second stage precision to width - 1; only clamp it
if it is greater.

* format.tl: Numerous new tests.

* txr.1: Significant redocumenting of this area. The handling
of numbers is described as a two stage process, clarifying the
changing role of "precision" in the two stages.

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