anchor.diff:  count,license
  -7,WTFPL
  +8,WTFPL
   1,WTF
   1,Various
   1,UNLICENSE
  
positive.code: 1,GSLv3
  1,GPLv3+
  9,GPLv3
  2,GPLv2
  5,GPL3
  15,GPL-3
  17,GPL-2
  
negative.code: 2,MIT License
  1,MIT (http://opensource.org/licenses/MIT)
  2,mit
  1753,MIT
  3,LGPLv3
  1,LGPLv2.1+
  1,LGPLv2.1
  