snpMatrix objects to snpStats objects
snpMatrix objects to snpStats
objects. convert.snpMatrix converts a single object, while
convert.snpMatrix.dir converts all stored elements in a specified
directory. They really only change the class names since most of the
classes in snpStats are backwards-compatible with 
snpMatrix. The exception is the ImputationRules class; 
imputation.rules objects will need to be regenerated.
convert.snpMatrix(object)
convert.snpMatrix.dir(dir = ".", ext = "RData")snpMatrix objects
  convert.snpMatrix returns the converted object. 
convert.snpMatrix.dir rewrites the files in place.