Added State::disableTexCoordPointersAboveAndIncluding( unit ) method so that

all unsed texture units can be turned off simply within Drawables such
as Geometry and GeoSet. This can be used to prevent bleed of arrays from
one object to the next - which can cause crashes.

include/osg/State

@@ -356,6 +356,22 @@ class SG_EXPORT State : public Referenced
             }
         }
 
+        inline void disableTexCoordPointersAboveAndIncluding( unsigned int unit )
+        {
+            while (unit<_texCoordArrayList.size())
+            {
+                EnabledArrayPair& eap = _texCoordArrayList[unit];
+                if (eap._enabled)
+                {
+                    if (setClientActiveTextureUnit(unit))
+                    {
+                        eap._enabled = false;
+                        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+                    }
+                }
+                ++unit;
+            }
+        }
 
         /** set the current tex coord array texture unit, return true if selected, false if selection failed such as when multitexturing is not supported.
           * note, only updates values that change.*/