[R-SIG-Finance] Prototyped support for "partial" and parallelism to rollapply.xts

[Ivan Popivanov]

I needed these two features, and thought they might be useful in general,
so I spent some extra time implementing them on top xts, see the
attachments. Not sure whether I managed to cover all cases, but it should
be a solid start if you decide adding them to the package.

Note: Only the Unix form of parallelism (mclapply from parallel) is
supported, but that's mainly for expedience. Adding support for parSapply
is feasible, but it usually leads to more cumbersome interfaces.

Regards,
Ivan
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