Problems with mapBlock()

[Sebastian Schelter]

I've updated the codebase to work on the cooccurrence analysis algo, but 
I always run into this error now:

error: value mapBlock is not a member of 
org.apache.mahout.math.drm.DrmLike[Int]

I have the feeling that an implicit conversion might be missing, but I 
couldn't figure out where to put it, with out producing even more errors.

--sebastian