Minor maintainance release. Interesting changes include
Added -b option to force backing store
Changed license to BSD license.
Performance optimizations
Updated usage command, which was sorely out of date.
Added -D option to specify display on server side
Added proxy port to lock file name, making it possible to run multiple
processes on the same unit on different proxy ports.
Support for LZO bitmap image compression
dxpc now accepts the new option -i[n] for image compression.
