ideally we should just get RF away from using py3tool by modernizing our code for easier compatibility between 2.7 and 3.x versions. See https://docs.python.org/3/howto/pyporting.html But for now just fixing up so our daily testing passes
Note to self: kill all `echo` calls with flags from the code base and use printf consistently.
The templates still need some love, but in general it works again.
This should resolve inability to save regression test datasets with older h5py e.g. on wheezy and precise