BUG:  Fixed log vs. non-log truncation.

stats.truncnorm needed a and b to be in the normal domain, not
the lognomral.  Get a and b from a nomral w/ mu and sigma,
then draw, then exponentiate if necessary.
API:  Allow get_rigid_output to pass along kind and size arguments.
BUG: Maybe my last commit didn't get the a, b changes for ln_dist
CLN: Reorganize by adding a Writing/ folder.
Adding tests for helpers.
Remove signal checking since it wasn't working.
API:  Add default params to truncated draw
PARAM:  Changing default paramaters.

wn=40, zn=20, pi_n =10
API: Using command line arg for path to params