[libmicrohttpd] HTTP Digest Auth done

[Amr Ali]

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Hi Christian,

I'm finally done with this module, I replaced the idea of an internal buffer
that stores nonces with implementing a timeout mechanism for each nonce that is
actually embedded into the nonce, so no need for increasing the memory
footprint. I however made the nonce timeout to be 300 seconds (which IMNSHO is
quote enough), its already made as a macro that you can override with
- -DNONCE_TIMEOUT <SECONDS>.

I made an example C program for it as well, its completely based on
minimal_example.c just changed/deleted a few calls.

As for combining this with MHD, I wanted to discuss how you want this to be
combined. The setup I have right now includes the files `digestauth.c' and
`digestauth.h' in src/daemon/Makefile.am, same goes for `digest_auth_example.c'.
I can change configure.ac to make it optional and not enabled by default, so if
someone wants this, he/she has to compile it from source with something like
"--enable-digest-auth"?

If you think this is good enough I'll make a patch for a the whole thing and
send it your way. If not, please let me know what you have in your mind.

Best regards,
Amr Ali
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