Add operations to project 2D number counts onto 1D models.

* Add methods to numberCountsDouble and subclasses
   (getBand[12]NumberCounts)
* Add basic unit tests; however, the band 2 projection test needs more
  work, since I don't have a comparison against independently
  computed values.
* Bump version number to 0.3.4.
Improve unwrapPD logic.

* In PDFactory/PDFactoryDouble::unwrapPD, try adjusting wrapping
  indices if they will fail the strict nsig2 cutoff.  Since that
  will always fail, there is no harm in trying to adjust them.
Debugging of projection for 2D models, add output capacity to _getdNdS

* Fix bug in evalCounts (in numberCountsDoubleLogNormal.cc) -- the
  counts weren't being divided by s1.
* Improve unit test of the projection by computing comparison model in
  IDL, added to model_test.
* Add ability to output projected band 2 number counts to
  pofd_affine_getdNdS.
* Improve docs, fix formatting of pofd_affine_getdNdS.
* Add HDF5 output to pofd_affine_getdNdS.
Merge branch 'unwrap'