4/26/99

- convert documentation to POD
- use Perl subrange operator (0..10)
- convert gnuplot filehandles to using the FileHandle module
- do paramter checking on subroutines that are accessed by user
- set up multiple level of debugging
- find more robust way to handle temporary files. use MkTemp.pm.
- more support for xrt
- turn on display of the x2tics and y2tics
