Proposed amendment to chartype structure, is_digit and get_digit

[Peter Gibbs]

I am working on adding support for additional chartypes to Parrot, plus
the capability for run-time registration of same. To this end, I would like to:

1) Add CHARTYPE* as a parameter to the <chartype>_is_digit/_get_digit functions
2) Create a new struct chartype_digit_map_t to contain mappings from code values
      to digit values
3) Add a pointer to the above struct to the CHARTYPE structure

Any comments on the above before I go ahead?

-- 
Peter Gibbs
EmKel Systems