[postgis-devel] Layout change

[strk at refractions.net]

I've committed the first change toward
	1) indipendence of liblwgeom from libpq
	2) better manageablility of LWGEOM types

Public header is lwgeom.h
Internal header is liblwgeom.h

Allocator and error reporters can be changed.
Currently they default to libpq funcs... easily changeable.

Geometry types management functions are stored in 
type-specific modules: lwpoint.c, lwmpoint.c, lwline.c,
lwmline.c, lwpoly.c, lwmpoly.c, lwcollection.c, lwgeom.c.

The LWGEOM type is an abstraction of OGC acceptable types.

More later.

--strk;