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.

--- a/scripts/deprecated/module.mk
+++ b/scripts/deprecated/module.mk
@@ -2,6 +2,7 @@
 
 deprecated_FCN_FILES = \
   deprecated/bicubic.m \
+  deprecated/delaunay3.m \
   deprecated/find_dir_in_path.m \
   deprecated/finite.m \
   deprecated/fmod.m \