New array handing options (spotnumbered)

[nk915]

Hello. master.

When using go-query, I thought that it would be good to have a spot separator in the array indexing (numberd option), so I added the source.

struct { V [2]string url:",spotnumbered"` }

url.Values{"V.0": {"a"}, "V.1": {"b"}} `

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