[FEATURE] added libkdtree++
[FIX] bug introduced by adding libkdtree
[FEATURE] add lemon lib
[FIX] replaced lemon-1.3.tar.gz by dev version
forgot to include lemon.cmake
fixed lemon tar.gz filename
fixed lemon tar.gz filename
[NOP] removed comments
Merge branch 'feature/ffal-libs' of https://github.com/hannesveit/contrib into feature/ffal-libs