Allow to retrieve a snapshot of the edited phylogenetic tree using javascript code...

Allow to retrieve a snapshot of the edited phylogenetic tree using javascript code, in order to be able to print or store it server-side. The ArchaeopteryxE class contains a getCurrentPhylogenyGraphicsAsBase64EncodedString public method which can be called from Javascript to retrieve the current image. This feature adds a dependency on the Apache common-codecs library (for base64 encoding).