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simplified backend interface. Removed stupid multi-way syncing.
Simplified/updated local and amz backends. Updated piclib and commands to
use it. Piclib now wraps its backend with a logging backend.
fixed logging backend errors and shortened its time format
removed redundant speclist. Made config settings be either from environment or fall back to defaults
cleaned up picdup and picput output
cleaned up logging backend and changed it's default location to come from env var
cleans up backend package and adds env var configuration