New date/time integration for cl-postgres

[Attila Lendvai]

> Why? Because neither local-time nor simple-date alone work well with
> all the date/time types that Postgres supports.

local-time was confused and it has some pending and serious TODO
entries regarding timezone handling.

this needs to be cleaned up in local-time before a better postgres
integration can be written.

it's doubtful i'll work on this any time soon, but i'm happy to answer
questions and/or extend the l-t TODO file.

-- 
• attila lendvai
• PGP: 963F 5D5F 45C7 DFCD 0A39
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