Duff Stewart had several helpful comments regarding the last commit for this PR.
These were addressed, along with some additional minor Notebook clean-up.

- fixed datetime labels on plots so they are readable
- added another example of a constrained estimate that might be useful

Fixed a number of issues with the Adjusted Data affine transformation matrix generator
in the IPython Notebook AdjustedPhase1GenerationTool.ipynb:

- original version mistakenly pointed to geohazards server for baseline web service,
  which requires a password; we only needed to read baselines, not write, and this
  functionality is provided by the geomag server.
- original version choked if only 1 baseline set was available when extracting a
  pier correction from the set
- original version did not filter time stamps quite right; updated version at least
  does not include times not requested, although it may return fewer than expected if
  the timestamp associated with a baseline set is later/earlier than the measurement
  times (this frequently happens due to a bug in the webabsolutes package that has
  been reported)
- generate plots with datetimes
- added non-active cell that constrains the affine transformation matrix to apply a
  uniform scaling factor instead of allowing separate scaling for different vecor
  components
- redid the pseudo definitive data calculations based on average baselines to better
  reflect how MagProc software works.
- inserted/modified markdown and docstrings to better describe what is going on.