Added ability to request fewer cpus for parallel computation. Also can now switch to threading model if necessary.
Restructured directory structure to be consistent with setup.py
Changed the spreadsheet checking so that 'Settings' is not included - problems with checking degenerate systems
Changed the threshold in checkcsv to 3E-2. All tests now pass.
Created commands in the root directory which should be similar to those created by a pip installation - pdgui, preader