2. set rate of 1 equal to 0 - fixes bug with feasible truncation algo where a lossless encode with multiple layers was
not in fact lossless

for multi-layer rate control, set initial upper bound for next layer to be lower bound for current layer, minus one

encode synch with plugin: only set and evaluate distortion if distortion is being generated by plugin

2. clean up some memory leaks

This reverts commit 982c6599b4512be68ee6f1e4452c92accd3fbb67.

2. fixed some issues with plugin refactor

plugin fails for some reason