Patch to read package-specific cabal-install config

[Carl Baatz]

Hi all,

for packages that aren't for public consumption, we would like to 
specify a private Hackage repo location. The simplest way we could think 
of to do this was to read a config file in the same format as the user 
config (~/.cabal/config) from the current directory and let any flags 
set in that file override the user config.

The attached patch implements this, reading any file with a 
.cabal-install extension (including '.cabal-install'). It errors out if 
more than one .cabal-install file is found or if there's a parse error 
on the .cabal-install file.

Does this sound like a good idea? If not, any ideas for alternative ways 
of handling non-public packages?

Many thanks,

Carl
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