* filesys.c (scm_select, retrieve_select_type, get_element,

	* filesys.c (scm_select, retrieve_select_type, get_element,
	fill_select_type, set_element): modified so that Scheme
	"select" tests port buffers for the ability to provide input
	or accept output.  Previously only the underlying file descriptors
	were checked.  Rewrote the docstring.

	* expect.scm (expect): don't call char-ready? before expect-select,
	since select now checks port buffers itself.  don't bother to check
	the time first either, since expect-select does it.