OCaml wrapper to SVM R packages e1071 and svmpath

Some OCaml functions to drive the RBF and linear SVMs of the R e1071 package and the linear SVM of the svmpath R package. The svmpath package allows to efficiently compute the list of cost values (lambda = 1/C) that need to be tested in order to find the optimal lambda. This package really fires up and talks to an R interpreter. The Svm module can handle dense or sparse data matrices. The Svmpath module only handles dense matrices.