phil 16dd3b375c Import libxo-0.9.0:
- Add xo_format_is_numeric() with improved logic to decide if format
  strings are numeric, so json output quotes them
- Convert docs to sphinx/rst
- update tests

Includes fix for PR 221676:
27d3021cc3 (diff-5a0d468963477f7daedb8308c219dd80)

PR:		 221676
MFC after:	5 days
2018-05-23 01:20:31 +00:00
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