git-ignoring .SyncIgnore (for BitTorrent Sync)
changes for the 2.0 release

* fixed line wrapping (column width detection)
* added switch (-F) to force execution
* improved wording
* fixed a bug when ARCHDIR == DIR (by disallowing it)
* inversed switch logic for subdir descending
* more consistent messaging to STDOUT/STDERR
* directories to consider must be marked with dotfile (.drotate)
updates to man page reflecting 2.0 changes