Adjusted documentation, added functions, rewrote functions

Added method isUndefined(value) that tests if values are undefined.

Added setter methods setMinimumTileWidth and setMinimumDividerWidth for
_minimumTileWidth and _minimumDividerWidth.

Adjusted documentation to reflect new rule.  For @param declarations,
type must follow parameter name.

Added init() functin that performs construction of the
sudokuInterface's private values.  This method is private.  Documented
init().

Documented and rewrote resize().