18-Jan-2000 0.001 Original Release
05-Mar-2000 0.1   Minor bugfixes and inclusion of demo program
                  Addition of -name option
26-Mar-2000 0.12  Minor tweaks to Makefile.PL and .conf files
		  Tested using HP-UX
31-Mar-2000 0.13  Change to makemake detection of pTk include directory
27-Apr-2001 0.2   Include simple script to apply pgplot patches
		  Minor fixes to demo.pl
31-Jan-2002 0.3   Updated for pgplot-5.2.2 (and Tk800.023). This includes
                  minor changes to the widget options and demo program
01-Nov-2007 0.4   Updated for Tk804.027. The most significant changes
                  were to ptkpgplot.c, to adapt it to the Tk changes. Also,
                  minor changes to Pgplot.xs, Makefile.PL, and demo.pl. POD
                  added to Pgplot.pm. Minor updates to other documentation.
                  PGPLOT.patch file renamed to PGPLOT-patch to avoid a name
                  conflict with pgplot.patch directory on Mac OSX.