cleanup related to RAW's port of RUN-PROGRAM:

cleanup related to RAW's port of RUN-PROGRAM:

comment fixes

resurrected SB-UNIX:UNIX-DUP, SB-UNIX:UNIX-IOCTL, and
SB-UNIX:UNIX-PIPE from old cmucl-2.4.8 sources (They'd been
deleted before 'cause nothing used them, but now RUN-PROGRAM
uses them.)

wrote simple regression test for RUN-PROGRAM

fixed dumb bug in QUIT :UNIX-STATUS (which had been exercised by
RUN-PROGRAM regression test)

made the "--noprint" option bind *LOAD-VERBOSE* to NIL (to help write
friendly-to-Unix-pipeline test programs, to help write regression
tests)