[CMake] 'unset' not in --help-commands-list (also, attn: neundorf)

[Matthew Woehlke]

Need a bug opened for this or is it trivial enough to fix on the spot?

Background:
I'm taking another look at a script that auto-generates command and 
keyword lists (for a highlighter for KDE's kate). The deltas in the 
command list are all either reordering or ITK/VTK stuff... except for 
'unset', which has a --help-command entry but isn't in the commands 
list. The keywords list has quite a few more deltas, for which I may 
start either complaining or opening bugs about (especially ones I know 
are legitimate). My goal here would be to have cmake fully documented, 
meaning that all useful keywords appear in the --help<whatever> output.

@neundorf: do we really want ITK/VTK commands in the generic 
highlighter? If "yes" I'm going to move them to their own section; since 
cmake does not document them they get (correctly, IMO) removed from the 
main list.

-- 
Matthew
Please do not quote my e-mail address unobfuscated in message bodies.
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