Log Message:
Update to 1.6.1

Upstream changes:
Changes in version 1.6-1

write.matrix.csr() now accepts a fac argument similar to read.matrix.csr(), \ 
writing factor levels instead of the numeric codes.

naiveBayes() uses a numerically more stable formula for calculating the \ 
a-posterior probabilities.

predict.naiveBayes() now accepts data with predictors in an order different from \ 
the training data, and also ignores variables not in the model (especially the \ 
response variable).

svm() checks whether parameters which are passed to the C-code are set to NULL \ 
to avoid segfaults.