Manpages, tweaks and fixes

Hi, I've done some additional work on the minecraft-installer, the main points are (as stated in d/changelog):
  * Server now defaults to the home dir unless a path option is passed
  * Server menu entry now executes server with GUI
  * Added manpages
  * New custom high-res icon (removed)
  * Disable using custom icons for server
  * Pre-Depends: imagemagick for client

  * Compatibility with minecraft past version 1.5.2

I would be very happy if you could merge these changes :)

Thanks