-Update: bring Doxygen file tags up to date
-Codechange: missed a few SCREEN conversions
-Codechange: declare some functions and variables static
-Codechange: convert function declarations to prototypes
Merge pull request #167 from wangds/cleanup

-Update: bring Doxygen file tags up to date
-Codechange: missed a few SCREEN conversions
-Codechange: declare some functions and variables static
-Codechange: convert function declarations to prototypes