Make liblogthread exit/reinit work

Hi Dave,

I was going to add "fork" support to liblogthread but I figured I'm the only one who cares.

So, instead, I made sure logt_exit() and logt_init() could be used over and over, as well as added logt_reinit() which uses the most recently used values from the last call to logt_init() or logt_conf().

-- Lon

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