Add back "single-meta" result option

[chnagy]

With e9b377d the 'single-meta' resultAction was remove as cleanup in lib/oracle.js and lib/oracle.html.

I would like to interpret the information of the amount of affected rows.
E.g. for an INSERT the 'single' result action only returns undefined.

Can we reintroduce the 'single-meta' option?

I could provide a pull request if needed.