[PATCH] Cleanup of JDBC character encoding

Hello,

With this patch I've done an attempt to make the handling of character
encoding in the JDBC driver a little clearer.

* Cleans up the logic to select a JVM encoding for a backend encoding.
* Makes the connection setup code easier to read.
* Gathers character encoding and decoding in a single place.
* Adds unit tests for encoding.
* Introduces a new class, org.postgresql.core.Encoding, and the
corresponding unit test class, org.postgresql.test.jdbc2.EncodingTest.

It shouldn't change the external behavior of the driver.

/Anders

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A n d e r s B e n g t s s o n ndrsbngtssn(at)yahoo(dot)se
Stockholm, Sweden