This function is intended for use by
make.cdf.env, which in turn is called by
make.cdf.package. User may not have much
benefit from calling this function directly.
In order to save memory, the name corresponding to each value in the
CEL is a factor. As in R factor objects
cannot be also of type matrix, the names corresponding to the indices
were stored in a vector of type character called
name.levels.
The same thing was done with the pbase and cbase information (more for
consistency than by conviction that some memory
could be saved here).