* ports.c: add SCM_PROC declarations for pt-size and pt-member.

	* ports.c: add SCM_PROC declarations for pt-size and pt-member.

	* Makefile.am: remove AWK=@AWK@.
	Add a rule for generating errnos.list.
	(CLEANFILES): put errnos.list here instead of in DISTCLEANFILES.

	* configure.in: add AC_SUBST(AWK) and AC_SUBST(ERRNO_EXTRACT).
	don't extract errnos, just set a variable (avoids the
	need to recompile error.c just because configure is run.)

	* unif.h: update prototypes.
	* unif.c (scm_uniform_array_read,write): change the offset and
	length arguments to start and end, for consistency.

	* __scm.h: uncomment SCM_ARG6 and SCM_ARG7, I needed SCM_ARG6.

	* ioext.h: update prototypes.
*	* ioext.c (scm_read_delimited_x): replaces scm_read_line and
	scm_read_line_x, it's a more general procedure using an
	interface from scsh.  read-line and read-line! are now defined
	in boot-9.scm.
*  	Note that the new read-line trims the terminator
	by default, previously it was appended to the returned string.  An
	optional argument specifies how to process the terminator (scsh
	compatible).  For the old behaviour: (read-line port 'concat).
	scm_read_line, scm_read_line_x: deleted.  (read-line port 'split)
	returns a pair, but is converted to multiple values if the scsh
	module is loaded.

	socket.h: update prototypes.
	* socket.c (scm_recvfrom): for consistency with other procedures,
	take start and end as separate optional arguments.
*	(scm_recv, scm_recvfrom): don't allow the second argument
	to be a size, only a buffer.  Change the scheme names to
	recv! and recvfrom!.  Don't return the buffer.

	* ioext.h, posix.h: move prototypes too.
	* ioext.c, posix.c (scm_read_line, scm_read_line_x, scm_write_line:
	moved back from posix.c to ioext.c.  Also move #includes of "genio.h"
	"read.h" and "unif.h".
	* ioext.c: include "chars.h"