defined basic graph type
Modified prototypes for graphs
Sine nodes expect a graph
Added graph field to node struct.
Graph field of node assigned properly.
Implemented Lav_createGraph
Functions for setting/getting output nodes.
Remove unneeded file.
Implement function to associate nodes with graphs.
Setup for using uthash.
Move private graph declatrations into graphs.h
Move sr onto graphs.
Node integrity tests pass
Fixed all the tests to use graphs.
call graphAssociateNode in Lav_createNode
Setup for Lav_nodeReadSamples
Preliminary implementation of Lav_nodeReadSamples
Converted sine test to use Lav_nodeReadAllOutputs
Fixed Lav_nodeReadAllOutputs
Created and implemented Lav_graphReadAllOutputs.