* vax-tdep.h: Update copyright year. Adjust comments.

* vax-tdep.h: Update copyright year.  Adjust comments.
(VAX_REGISTER_SIZE, VAX_REGISTER_BYTES, VAX_MAX_REGISTER_RAW_SIZE,
VAX_MAX_REGISTER_VIRTUAL_SIZE): Remove macros.
(vax_regnum): New enum.  Replacing...
(VAX_AP_REGNUM, VAX_FP_REGNUM, VAX_SP_REGNUM, VAX_PC_REGNUM)
(VAX_PS_REGNUM): ... these removed macros.
* vax-tdep.c (vax_register_name): Remove prototype.
(vax_register_name): Reorganize somewhat.  Use ARRAY_SIZE.
(vax_register_byte, vax_register_raw_size,
vax_register_virtual_size, vax_register_virtual_type): Remove
functions.
(vax_register_type): New function.
(vax_breakpoint_from_pc): Reorganize.
(vax_gdbarch_init): Set register_type.  Don't set
deprecated_register_size, deprecated_register_bytes,
deprecated_register_byte, deprecated_register_raw_size,
deprecated_max_register_raw_size,
deprecated_register_virtual_size,
deprecated_max_register_virtual_size and
deprecated_register_virtual_type.  Add comment on stack direction.