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Asynchronous API extracted from epgsql_sock into epgsqla (returns whole result sets) and epgsqli (returns row by row results).
Original tests are used to test all APIs through emulation modules.
Execute several prepared statements as a batch (execute_batch).
Bind timestamps in erlang:now() format.

6f9d545 2011-11-01

Asynchronous API is implemented by epgsql_sock.erl, see epgsql.erl for examples.
gen_fsm replaced by internal queue of client requests.
Results can be delivered as regular erlang messages.
Single process to hold driver state and receive socket data.
Slight code reorganization.