Update searchtree library
Update searchtree library

Implemented depth-first search of the neume search tree, which searches
for a payload in the tree and returns the neume typeid, name, and edge
    weights along the path from the root node to the target node.

DDMAL/Neon.js,avorio/Neon.js,DDMAL/Neon.js,avorio/Neon.js,DDMAL/Neon.js,DDMAL/Neon.js,avorio/Neon.js,avorio/Neon.js