several bugs fixed (ltemplify.py, dump2data.py, lttree_postprocess.py)

Several bugs were fixed in ltemplify.py, dump2data.py, and lttree_postprocess.py. The ice and other water examples have been fixed (replacing "fix shake" with "fix rattle" everywhere). Thanks to Nathan Odendahl (UC Berkeley), and github user "davidfir3" for feedback, bug reporting, and bug fixing!