Remove use of Python eggs.

Add to configure checking for Python modules pyre, journal, and
spatialdata. Add setting of PYTHON_EGG_CPPFLAGS using one line of Python
code.
Added version number to pylith Python module.
Ignore more generated files.
Merge branch 'baagaard/remove-python-eggs' into next

* baagaard/remove-python-eggs:
  Ignore more generated files.
  Added version number to pylith Python module.
  Remove use of Python eggs.