kangaroo

Copperbox revision 1024.

I've now added the withinRegion operation - this is the important one as it enables random access. I've decided to allow it to only access regions within the current region rather than regions anywhere in the file. This is so that the nesting in the program reflects the region movement - i.e. the top level parser sees the whole file (array) and nesting within the parser nests the accessible regions with the array.