[postgis-devel] LRS functions

[strk at refractions.net]

We've added two LRS functions with semantics
specified by ISO SQL/MM:

	- locate_along_measure(geom, measure)
	- locate_between_measures(geom, m_start, m_end)

Differently from Chris version the M values
are not assumed to be consecutive, so an input
LINESTRING can result in a collection of
LINESTRINGS and POINTS in output.

Polygons, multipolygons and collection types are
NOT supported, all others are.

In the process of finalizing semantics all comments
and tests are welcome (in HEAD branch).

--strk; 

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