Fix a bug in Edit page

edit.js
- Fixing Y position of Leaf against Tree to write out to JSON: Now it considers the offset of drag/droppable Leaf from the top of the document through _fromTopY variable.
- Margin/Padding/Height of the Title of the edit area section needs to be defined in Javascript to define _fromTopY variable, because they cannot be loaded early enough for being calculated in Javascript when they are defined in CSS.
- Some unused  commented codes are deleted.

main.css
- #editArea h3 is added only for information above
Added some more dog data and pictures.

dogdata_Original.json: Very original json file which contains only data for 4 dogs.
Deleted a debug statement