Log Message:
Update of net/overnet to 0.51.2. PR#23945 from Min Sik Kim.

Many changes since 0.48 (see http://www.overnet.com/versions.html for a
full list) including:
    * Many crash bugs fixed
    * Many features added
    * zlib Server support
    * HTTP links recognised even if not exactly "http://" at front
    * Flat style download progress bar
    * Drag and drop support
    * New Horde download system
    * ed2K links: Files over 2GB sizes are correct now
    * Ports greater than 32876 are now shown correctly