Some infrastructure for transaction support.

ConnectionProvider may normally return the same connection for a call to
getConnection(), so we add a separate getTxConnection() which is guaranteed to
always return a connection that's not in use by anyone else.

The DataSourceConnectionProvider already meets that requirement because it
returns connections from a pool, but the StaticConnectionProvider does not. In
the latter case, we just open a new connection to the database every time you
do a transaction. Since StaticConnectionProvider is only used for testing (in
conjunction with Depot anyway, Yohoho uses it in production IIRC), this is not
a big deal.
Tx connections are always read-write.
No auto-commit for tx connections.
Preparing for samskivert-1.8.3 release.
Preparing for 1.9-SNAPSHOT development.
Move eclipse hackery into a profile.
Profile for deploying to a directory.
Minor javadoc fixes.
Put Ant build results in the same place as Maven.
Specify test_dir in the unit test.

Now that it's consistent, we can avoid extra build shenanigans.