renamed base_width parameter of built-in furry ball object to root_width.
cosmetics.
many improvements to the foundation/utility/commandlineparser module.

- added support for mandatory arguments.
- added error and warning counters.
- refactored the code.
Merge branch 'master' of github.com:appleseedhq/appleseed
added comments.
new makefluffy tool to grow hair on any scene.