Opening /very/ big files

[Stephen J. Turnbull]

Didier Verna writes:

 > somebody recently asked me if it was possible to have XEmacs only load
 > parts of files in buffers instead of loading the whole files. They have
 > files that can grow up to 1Go or more, which fills up their memory.

See the docstring for `insert-file-contents', specifically the START
and END arguments.  I'm not sure what happens in Mule if you specify
octets that do not correspond to a character boundary.