[xmonad] Issue 182 in xmonad: Key bindings should be showable

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Comment #3 on issue 182 by gwe... at gmail.com: Key bindings should be showable
http://code.google.com/p/xmonad/issues/detail?id=182

I vote for #3. #1 and 2 both look like they will break extensions, configs,  
or both, and people simply don't care about newbie documentation enough to  
support breakage just for their sake. #3 avoids this, so actually has a  
chance of getting consensus.

Simplest would just be binding M-? to xmessage with a large static string  
specifying the defaults. Zero breakage\* and the newbies get the  
documentation they need; people customizing their config already know what  
keys they modified.

Technically, we'd have to update it every time we change the default  
bindings. As far as I can tell, the last time a binding was added or  
removed (rather than fixed or improved), was almost four years ago, in  
March 2008 when Spencer commented out M-b which was some sort of  
toolbar-gap-toggle.

This seems like an improvement to me.

\* anyone binding M-? in their existing config will be overriding the  
default keymap and so will not be affected. And as far as I can tell, no  
one *does* - in the XMonad config archive are only two hits for `xK_slash`,  
both of which are not shifted and so not question-mark bindings.