numfmt: minor improvements to --field parsing

[Assaf Gordon]

Hello,

attached two small patches:
===
Subject: [PATCH 1/2] numfmt: improve --field parsing, add tests

* src/numfmt.c: parse_field_arg() detect and fail on negative values
  (previously, implicit conversion from signed strtol to unsigned size_t
  failed to detect those); detect and fail on invalid ranges '1-2-3';
  avoid adding superfluous range item for 'N-N' ranges.
* tests/misc/numfmt.pl: test above scenarios, add few more tests for
  better coverage.

Subject: [PATCH 2/2] numfmt: fix coding style

* src/numfmt.c: parse_field_arg(): change whitespace and braces,
   no change in functionality.
===

regards,
 - assaf

numfmt-field-parse-arg.patch
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