fileobject.c: report more moeaningful error for I/O on closed files;
user getargs() everywhere.

Added new module dbm (interface to ndbm).

interfaces to variants of select() system call, "myselect.h".  This includes
adding fileno() methods to files, sockets and stdwin.

arguments crashed in INCREF() calls which should be XINCREF() calls.

timemodule.c: fix for SEQUENT port (sys/select, struct timezone) by
Jaap Vermeulen

xxobject.c: include modsupport.h

  -1 for errors)

default DATE is now 3 Jun 1992