Added daily rate field to project setup.

Field checking in project properties is now from left panel  (up->down) to the right panel.

Centering is now working. Don't call setLocationRelativeTo() before pack()... DOH!

Javadocs on about dialog methods.

If no version file is present the version will show as undefined.
Merge pull request #94 from paffman/feature/project-setup-assistant-daily-rate

Added daily rate field to project setup.