[R] LiblineaR: accept sparse matrices

[Sam Steingold]

Thibault,

It would be nice if LiblineaR() accepted data in the form of a sparse
matrix (it does not accept whatever e1071::read.matrix.csr returns).

It would also be nice if there were functions to read/write files in the
native liblinear file format; I am sure the original liblinear library
provides at least the input code.

Thanks!

-- 
Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000
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