Modifications to support BIRD molecules.

git-svn-id: file:///home/svn-repositories/biojava/RCSB Viewers/trunk@10003 7c6358e6-4a41-0410-a743-a5b2a554c398
Modifications to support BIRD molecules.

git-svn-id: file:///home/svn-repositories/biojava/RCSB Viewers/trunk@10004 7c6358e6-4a41-0410-a743-a5b2a554c398
Only add polymer bonds between either standard amino acids or standard nucleic acids. All other bonds are created from struct_conn records.

git-svn-id: file:///home/svn-repositories/biojava/RCSB Viewers/trunk@10005 7c6358e6-4a41-0410-a743-a5b2a554c398