Fixed various typos in comments.
Enhanced removeRootDirFromPathname() function.

Added support for Windows-specific wide character encoding (UTF-16) to the
removeRootDirFromPathname() helper function. Also added a new test case.
Enhanced createDirectory() function.

Added support for Windows-specific wide character encoding (UTF-16) to the
createDirectory() helper function. The second parameter "rootDir" is still
optional, but has no default value any more (due to the fact that OFFilename
is not completely specified in the header file; forward declaration only).