Return custom format from server

Remove old main file.
Transform custom format return by server to the one jstree accepts.
Post modifications on chapter to server

Use arboreal module (not published) to find nodes in the tree.
Doesn't work because modify a node doesn't modify the whole tree yet.
Fix interval change post to server

Remove dependency to arboreal as it forgets the link to the passed in node and doesn't provide a way to reconstruct a tree in another format.
Find a chapter only among the first children.
Does not reselect a select chapter after modification.
Fix chapter search

Can find a chapter at any depth in the tree.