Remove deprecated methods and constructors ahead of optiq-0.4.18.

Fix broken links in javadoc.

Mark RexNode.clone() as deprecated, and remove calls to it.
Move implementations of closeOnCompletion() and isCloseOnCompletion() up to AvaticaStatement. They are only required in JDBC 4.1 and later, but it can't hurt.
Rename "package.html" files to "package-info.java".
Upgrade to eigenbase-xom-1.3.4, eigenbase-properties-1.1.4, eigenbase-resgen-1.3.6.
Reformat code.