Unimplemented methods

[Marvin Humphrey <ma...@rectangular.com>]

Greets,

Some methods which are declared within the core will have to be implemented by
each binding;  Obj_To_Host() is the archetypal example, but there are others as
well.

We'll make this work by creating multiple .c files when a class has
unimplemented methods.

  trunk/core/Lucy/Obj.bp    <-- declare methods here
  trunk/core/Lucy/Obj.c     <-- missing Obj_to_host
  trunk/perl/xs/Lucy/Obj.c  <-- Obj_to_host implemented here

Each host binding will need its own Obj.c file where Obj_to_host can be
found.

Marvin Humphrey