- Added -a command line option to enable user to supply a guess as to how
  large the delineated watershed should be.
- Fixed bug where pre-existing masks were not cleared at the beginning of the
  script
- DelineateWatershed: added 'watershed_area_estimate' and
  'watershed_area' to metadata written
- ImportRHESSysSource: added compilation of lairead
- Added CreateWorldfile.py, which will generate a RHESSys worldfile.
- Numerous changes to other scripts to enable CreateWorldfile.py.