[nas] Add support for specifying nasd config file

[Steve McIntyre]

I've had a feature request from a Debian user who wants to use nas to
control multiple sound cards. This is difficult at the moment, as a
single server only supports a single input/output device pair. An easy
way to make this work would be to run multiple instances of nasd, one
for each card. There is currently no way to tell the server to use a
specific config file to make this happen. The attached patch seems to
work for me - use the -config <file> option to specify a non-default
config file on the nasd command line.

What do you think?

-- 
Steve McIntyre, Cambridge, UK.                                steve at einval.com
There's no sensation to compare with this
Suspended animation, A state of bliss
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