Remove default case for structure_for_dist
Remove now-unused structure_for_range
Re-format expTransform.
Temporarily (?) make sampling for logNormal an IO action.
Also make dirichlet sampler an IO action.
Sample real parameters using sample'.
Generate TrueFalseRange and IntegerInterval using sample'.
Define structure_for_dist entirely in terms of sample'.
Remove VarBounds notes.
Stop using old method of finding Simplex parameters.
Stop defining components of pi separately.
Add routine to set value for all regs.