Defines the native interface used for accessing Fennel storage from Java.
{@link net.sf.farrago.fennel.FennelStorage} contains the native method
declarations, which are wrapped by {@link
net.sf.farrago.fennel.FennelDbHandle}. {@link
net.sf.farrago.catalog.codegen.ProxyGen} implements the code generator used by
the build to produce C++ classes for binding to Fennel. See the design doc for more
details.