[R] randomForest speed improvements

[apresley]

Andy,

Thanks for the reply.  I had no idea I could combine them back ... that
actually will work pretty well.  We can have several "worker threads" load
up the RF's on different machines and/or cores, and then re-assemble them. 
RMPI might be an option down the road, but would be a bit of overhead for us
now.

Using the method of combine() ... I was able to drastically reduce the
amount of time to build randomForest objects.  IE, using about 25,000 rows
(6 columns), it takes maybe 5 minutes on my laptop.  Using 5 randomForest
objects (each with 5k rows), and then combining them, takes < 1 minute.

--
Anthony
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