v1.0 ihaque 5/30/06 initial version
v1.1 ihaque 5/31/06 added equipartition binning
v1.2 ihaque ??? added k-means binning
v1.3 ihaque ??? added rendering to disk
v 1.31 ihaque 3/1/07 moved functions from EXPORT to EXPORT_OK
added named-argument wrappers to generate_kml_file and generate_kmz_file
added perldoc
v 1.32 ihaque 3/2/07 fixed documentation bug with SYNOPSIS
changed default font path to that for FreeSans
v 1.33 ihaque 6/22/07 added rudimentary support for altitude-mapping data
changed default font path to that for FreeSans
v 1.34 ihaque 9/19/07 fixed bug relating to spaces in the polygon string passed to kml_polygon