add R.appendTo and R.prependTo

These functions are certainly useful: I use `R.append` and `R.prepend` in conjunction with `R.flip` or `R.rPartial` quite often. They're also easy to name. These two facts make them a straightforward addition.

For consistency, perhaps we should add `R.concatTo` as well? I find myself flipping `R.concat` from time to time as well.

My feeling is that I would rather not use `R.foo` internally anywhere.  I'm not quite sure of the rationale for this prejudice, but it's a very strong one.  There's a big part of me that regrets using this style rather than a revealing module pattern.  If we'd done it that way, these questions would simply not have arisen.