plist_from_json() fails on JSON numbers containing e+ exponents

[sctol]

plist_from_json() fails when encountering JSON number tokens containing explicit positive exponents "e+" or "E+" followed by the exponent digits. It does work for "e-", "E-", "e", and "E". The current JSON standard (json.org) and RFC 8259 allow for JSON numbers to contain '+" in the exponent. jplist.c line 514 to 549.

For example:

{ "real":1.23456e4 } works

{ "real":1.23456e+4 } fails

[nikias]

See e3568d8. Will be added in next release.2q