In SIGNAL, bind *break-on-signals* to NIL even before doing the type test so
that we don't wedge the error system if the type is malformed or undefined.

Changed the default for library: under hpux to be /usr/local/lib/cmucl/lib.

Compiler:

 -- Do DFO-AS-NEEDED in BYTE-COMPILE-COMPONENT (as it is done in
    NATIVE-COMPILE-COMPONENT) to ensure that cleanup code has block numbers.
    Also added some MAYBE-MUMBLE calls for *COMPILE-PROGRESS*.
 -- Changed assert-definition-type to quietly ignore non function-types.
 -- Allow stream arg to compile-file.
 -- Deleted incorrect type declaration in process-1-ftype-proclamation.
    Deleted test for function-type-p around call to assert-definition-type,
    since this is now folded into the function.  Previously several calls
    weren't doing this necessary check.

Motif interface:

 -- Add INVOKE-TTY-DEBUGGER.  Don't try to invoke motif debugger if we didn't
    succeed in opening a connection.
 -- Print warning in status hook when server dies.
 -- Made server to fflush after all output so that we see output when it is run
    on a pipe.

PCL:
 -- Fix to update-instance-for-different-class.
