make tests quieter
toMaple is helpful for debugging
cleanup of update-archive.mpl
clarify a comment (at least for me)
tests using Sample and/or MWC should not be in this file!!
(makes it really hard to debug on some platforms where MWC does not
work in ghci)
minor tweaks to the shape of some of the tests
normal density
Implement:
1. AST simplification
  a. right id rule for >>=
  b. simplification of singleton weight 1 superpose
  c. sorting of superpose (for insuring more deterministic output)
2. recognition of normal density (and normalization factor)
3. simplification of 'useless' last condition on a piecewise
Merge branch 'master' of https://github.com/hakaru-dev/hakaru
re-enable t21.  Switch order in testGibbs2 and t23.
deal with sqrt properly
1. add simplifications for
  a. nested superpose
  b. if with undefined (first) branch
2. infer types for Measures, not just values
3. widen the cases where normal density is recognized
Add tests to simplify and sample from testPriorProp
Use toMaple in simplify
Adding Slam to Examples

- Running it will simply print a usage message
- Need to figure out a place to put data files
  before properly running this code