[postgis] new function max_distance(line,line)

[Dave Blasby]

I've added a simple function to the CVS version.

max_distance(geometry, geometry)	
		returns NULL if both geometries are not linestrings
		Otherwise,
			For each point in line 1
				Find the line-to-point distance to line 2
			Return max distance

Note: max_distance(line1, line2) is different than
max_distance(line2,line1);

The result is a bit difficult to interpret, but it does contain a lot of
information.

dave

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