[Changeset]: Add "-regexp" option to Fwho, Fwhos and Fclear

[David Bateman]

The attached changeset adds the "-regexp" option to Fwho, Fwhos, Fclear.
It uses regexcomp so it assume that regex is available, and so maybe a
pcre version of the regex_match class should be written as well, but as
we don't use named tokens in the case concerned this isn't important.

I also looked briefly at the "-file" option for Fwhos and it seems the
load-save.cc (do_load) function already partially implements this idea,
though hooking that up with the variables.cc (symbol_info_list) class is
not obvious. Also it seems to me that the reason for the -file option is
to allow variables in files to be listed even if they are too large to
be loaded, and so it doesn't make sense to have the octave_value stored
in the symbol_info_list class for that case. However, the changes to get
all this to work seem a bit invasive for the amount of time I have
available.

D.
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