Added RotationAxis, which calculates (and displays) the axis of rotation for alignments.

git-svn-id: file:///home/svn-repositories/biojava/biojava-live/trunk@10018 7c6358e6-4a41-0410-a743-a5b2a554c398
Added constructor to RotationAxis

git-svn-id: file:///home/svn-repositories/biojava/biojava-live/trunk@10019 7c6358e6-4a41-0410-a743-a5b2a554c398