Regrid functionality

Author: davidhassell

docs/source/introduction.rst

@@ -96,9 +96,10 @@ manipulation and can:
 * perform histogram, percentile and binning operations on field
   constructs,
 
-* regrid field constructs with (multi-)linear, nearest neighbour,
-  first- and second-order conservative and higher order patch recovery
-  methods,
+* regrid structured grid, mesh and DSG field constructs with
+  (multi-)linear, nearest neighbour, first- and second-order
+  conservative and higher order patch recovery methods, including
+  3-d regridding,
 
 * apply convolution filters to field constructs,