ENHANCEMENTS:
+ - Added the --only-write-batch=FILE option that may be used (instead
+ of --write-batch=FILE) to create a batch file without doing any
+ actual updating of the destination.
+
- Changed the outputting of "safe" filenames to use backslash-escaped
characters rather than '?'s. Any non-printable character is output
using octal (e.g. "\n" -> "\012"), and backslash is output as "\\".