[CVS ci] datatypes (was: Parrot 0.0.9)

[Leopold Toetsch]

Steve Fink wrote:

  - the various unions should probably be coalesced into one

I did check in my datatypes patch.
- all? native and other data types are summarized in datatypes.h
- hash and list use the same enums now
- datatype.c has currently 2 functions to retrieve types per name/enum
(conversion functions could go here later)
- core.ops is adjusted, to retrieve data types or check, if a type enum is valid
- test included

leo