* Add the 'rescan interfaces' item to the interfaces submenu
* make sure to change subnet bits to supernet bits when in 
  CIDR mode (release 0.5)
* check RFC 1878 (release 0.6)
* Changing subnet bits label shouldn't resize subnet bits
  spin button
* create a library for all of the IP address routines instead
  of splitting them between prips and ipsc
* man page for ipsc
* IPv6 support (Matthew)
* Add information: Number of class C: <>, B: <>
