Repository reorganisation

The framework directory was renamed to demo. A dataio directory was created and placed unpack.py (renamed to wod.py) in it. The data directory was moved into demo. qctests and codetests directories were created for tests on data and tests of the code. File paths coded into the existing code were modified so that they still work. 

wod.py has been edited to fix the specification of the taxanomic data and the main class renamed to WodProfile. A test data file that can be used to test the performance of the WodProfile class has been added.