[patch #6035] Implemented CD command

[Ben Pfaff]

Follow-up Comment #1, patch #6035 (project pspp):

This does what I'd expect a CD command to do, but it doesn't do everything
that the SPSS CD command does.  In particular: the CD command can specify a
file handle instead of a directory name; the directory name may use a
system-specific environment variable syntax (see
http://groups.google.com/group/comp.soft-sys.stat.spss/browse_frm/thread/50d9ca6f45b5d8bd/a440d6a22083e496?lnk=st&q=CD+command+with+environment+variable&rnum=1#a440d6a22083e496);
and the directory name may actually name a file (existing or non-existing), in
which case the file portion is stripped.

Also, I am unsure how CD should interact with file handles.  If I specify a
file handle as pointing to a file named 'foo.dat', and then I CD to another
directory and use the file handle, should it refer to foo.dat in the old or
the new directory?

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