20041229: initial release
20050119: fixed glitches in drawing of parallels and meridians.
20050121: proj.4 is now called via a C-library interface, instead
of using the proj command-line tool via os.popen.
20050124: some code reorg, fixed bugs in S. Hem. projections.
xmin,xmax,ymin,ymax Basemap instance variables renamed
to llcrnrx,urcrnrx,llcrnry,urcrnry. Added __call__
and makegrid methods to Basemap class.
20050130: no user visible changes. Uses new pyrex generated
C extension interface to proj.4 which is twice as
fast as the Thuban one.