Added Log4J to POM.
Added support for Astral sets.
Comments.
Moved general XML utilities to a new class ReadUtils.
Created classes for RCSB ligands (should have committed this a while
ago).
Fixed demo: can't use same structure.
Set ScopFactory to 1.75B to prevent test failure.
Use Log4J logging instead.
Added Log4J configurations.
Oops. Shouldn't have pushed. Fix "org.biojava.structure" -->
"org.biojava.bio.structure".