Deprecate delaunay3 and extend delaunay to 3-D inputs. * NEWS: Announce deprecation of delaunay3. Announce extension of delaunay to 3-D inputs. * scripts/deprecated/delaunay3.m: Moved from geometry/. Print warning about deprecation when executing function for the first time. * scripts/deprecated/module.mk: Add deprecated delaunay3.m to build system. * scripts/geometry/module.mk: Remove from geometry directory build system * delaunay.m: Redo docstring to mention 2-D and 3-D inputs. Overhaul function to accept 3-D inputs. Add %!error input validation tests. * delaunayn, tetramesh.m: Remove seealso reference to delaunay3. * geometry.txi, install.txi: Remove delaunay3 from manual.

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