Enhancements to rectObj

[sgillies@…]

Extending rectObj with a 4-arg constructor so that we can initialize a rectObj

    r = rectObj(-110.0, 37.0, -105.0, 40.0)

and also a toPolygon method which uses msRectToPolygon and allows

    s = r.toPolygon()  # new shapeobj instance from the rectObj

For completeness, it would be nice to have a method that returns the four
principle values as a tuple, allowing

    minx, miny, maxx, maxy = r.toTuple()
    
or

    mapobj.setExtent(r.toTuple())  # setExtents takes the same arguments as
                                   # the rectObj constructor

Also nice to have would be toWKT and toWKB methods for use with PostGIS
and GEOS, although these might be better implemented for the shapeObj class.

Am also considering a toString method with a single separator argument
allowing

    bbox = r.toString(',')  # returns '-110.0,37.0,-105.0,40.0'

This is functionality that I require all the time.

These enhancements are part of a project that I am tentatively calling the
Primitive Mapscript Classes project.  Have made a Wiki page:

http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?PrimitiveMapScriptClassesProject

and from this Wiki page will link back to Bugzilla.  Maybe this can serve as
a template for other such projects.

[sgillies@…]

Have committed new constructor and toPolygon to CVS branch 4.1

[sgillies@…]

Added note to HISTORY.TXT