- Add morris.getGenome() routine to retrieve the genomes of datasets.  Update code that was using custom code to use the starndard routine now.
- add some assertions (stopifnot) to make sure arguments conform to expectations.
- modify plot.profile to allow half-ranges tin indicate a range that includes the end-point.   c(250) would indicate  range starting at 250 through the end of the transcript (or end of CDS if units="aa")
- allow empty range "c()" or NULL to indicate a complete range over the entire transcript.
- update to use new capabilities for specifying ranges.