TODO: Rename some /contrib modules from pg* to pg_*

Hello,

I read this as:

1. Fix makefiles so that contrib modules such as pgcrypto are not pg_crypto

2. Move directories to reflect above

3. Fix source and makefiles within sub project directories to create 
binaries and libs with correct output.. thus libpgcrypto.so.0.0 would 
become libpg_crypto.so.0.0

Is this correct? If so I personally would like to claim this TODO.

Joshua D. Drake

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