[Pkg-grass-general] New grass 5.7 package

[Steve Halasz <debian@adkgis.org>]

I uploaded grass 5.7.0-6 to:
http://bullhorn.org/debian/dists/unstable/main/

changelog:

  * link /usr/bin/grass to /usr/bin/grass57
  * debian/control
    - edits to description
    - create grass-doc package
    - don't have libgrass depend on grass
  * debian/rules
    - install to /usr/lib/grass instead of /usr/lib/grass57
    - run dh_shlibdeps

Steve