Change 192 on 1998/09/26 by <gbarr@pobox.com> (Graham Barr)

	- OPTIONAL can now optianlly encode, passing undef anywhere in the
	  opList will cause the whole list not to be encoded
	
	- BER will no longer complain if passed undef as an argument, it
	  will just do nothing.

Change 174 on 1998/07/21 by <gbarr@pobox.com> (Graham Barr)

	Added CORE:: prefixes to keep 5.005-beta quiet

Tue Jun 16 1998 <gbarr@pobox.com> (Graham Barr)

	t/00prim.t
	- tweak to ensure test runs on the Mac

Mon Jun  8 1998 <gbarr@pobox.com> (Graham Barr)

	Added some tests to t/00prim.t
	
	Changed date in pod

Sun Jun  7 1998 <gbarr@pobox.com> (Graham Barr)

	more speed improvements, approx 30% faster encode
	- changed to use an array instead of hash
	- new num_length
	- new pack_tag
	- inlines some internal method calls


	- speedup changes to num_length

Sun Nov 30 1997 <gbarr@pobox.com> (Graham Barr)

	- unpack_tag was not checking that it unpacked what was expected

Wed Nov  5 1997 <gbarr@pobox.com> (Graham Barr)

	Updated BER.pod