* Move the responsibility for resetting port buffers from the

	* Move the responsibility for resetting port buffers from the
	caller of the ptob seek procedure to the implementation.  This
	gives more control in general to the ptob seek: in particular the
	change of 1999-10-20 can be made to work without breaking seek on
	string ports.  There's a comment in NEWS about upgrading port
	types.

	* ports.c (scm_seek): don't reset the port buffers here.

	* fports.c (fport_seek): reset the buffers, except for the
	0 SEEK_CUR case.

	* strports.c (st_end_input): (bug fix): decrement pt->read_pos by
	offset.  check that it's not less than read_buf.
	(st_seek): reset the buffers first, unless it's the 0 SEEK_CUR
	case and currently reading.