deprecating msh in favor of hush

[Mike Frysinger]

ive gone through msh and hush a bit and did a comparison ... here's what msh 
provides but hush does not in latest trunk:

 - login
 - newgrp
these make me go "wtf are these in the shell?"

 - readonly
not really important seeing as hush doesnt provide a way to declare read only 
variables.  afaict, POSIX doesnt require this, so i say we chalk it up as 
"bashism that'd maybe be nice to have at some point" and see if anyone 
actually complains.

 - times
a bashism that looks pretty useless to me and isnt in POSIX.  let it die.

 - trap	
this is about the only thing that hush needs, but we already know that.

considering all these things, i say we start the process of deprecating msh.  
for now, that means simply adding "(deprecated)" to its description in kconfig 
and telling people to migrate to hush.

any qualms with this ?  that'd get us down to two shells (ash and hush) and 
i'm fine with letting those two live.  ash doesnt look like it'd be able to 
scale down to no-mmu anyways ...
-mike
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