Inconsistent quote and escape handling in parameter expansion

[Ondrej Oprala]

Hi all,
I've attempted to write a patch fixing an issue mentioned here 
http://lists.gnu.org/archive/html/bug-bash/2012-02/msg00106.html a while 
back. It basically wraps parameter expansion around a new context of 
it's own, using it to make another condition for single-quote 
substitution. While it's by no means perfect, it makes parameter 
expansion a bit more sane IMHO. The change should eventually have a new 
compat option, since it breaks a few test cases (I suppose making it 
fully backwards-compatible is impossible). I'd really appreciate some 
comments and advice on the patch's approach and/or necessary improvements.

Thanks,
Ondrej

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