Third check-in addressing Issues #83 and #84.

Added w_translations to minctracc parameters that can be specified via .csv. Updated LSQ12.py, NLIN.py and example protocols accordingly.

Two other misc changes:
1. Removed LinearHierarchicalMinctracc. It was unfinished and unused.
2. Updated comment in minc_parameters.py, accidentally omitted from previous check-in.