Minor setup_photo_link bug fix

Minor fix and removal of commented lines of code
Converted Pull_animals to create_html_node

Converted all the manual node creation calls over to the create_html_node function system. Also removed the "parent" parameter from the Pull_animals version of the function, because it was unused by any of the calls.
Added jQuery tooltip to Behavior Evaluation color

Added a jQuery tooltip which describes the meaning of the Behavior Evaluation colors. This tooltip is shown when hovering over the superscript "What is this?" link next to the animal's behavior color.

Added necessary CSS to style the tooltip.