Refactor code
BugFix: show link arrow
Now change to different graphs without press ctrl key. Every node will be scaled if mouse over it.
Refactor the code. all deleted objects are stored in the same place. initial version.
no longer use title as id. Show different struffs according to node type
Refactor
archive before reorganizing
Archive before new round of refactor
Remove some uncessary code for dealing with links. Use mouseVars to handle selected elements
Refactor move functions to deal with selected nodes into separate functions
refactor separate intitialization for tag graph and item graph
Merge branch 'refactor'