Move to com foundationdb

Move all the source files to the package com.foundationdb.sql.jdbc, to avoid namespace collisions with the original postgres JDBC driver. The files have been moved into a maven standard directory layouts (src/test/java, src/main/java). Building the pom file requires both more changes both to a pom file and code. 

This is a pretty automatic name change, but there are a few updates in the build.xml, *.java.in files. There are three small test changes around the serial column/hidden PK issue as seen in other test system.