Move tests into a directory
Importing for 1:250 and 1:1250 situation

- Changed the import_measure_xls script: if a row has six values instead of five,
  the sixth is assumed to contain the water level difference for the 1:250 protection
  level.

- Removed unused ReferenceValue model.
Require factory_boy for tests
Also remove ReferenceValue from admin.py
Add some more infrastructure for testing, fix bugs found with first tests(!)
Further remove reference value
Further remove reference value
Paranoia, making sure that we're testing the right thing
Changed the import_vertex_xls script to import the year

Headers may now start with the year (2050 or 2100) followed by a :,
and this year value will be saved with the VertexValue.  If no year is
present, assume 2100.
Merge pull request #30 from lizardsystem/remco-work-on-scripts

Remco work on scripts