use version dependent variable
extract the magic number 0.8 to a constant
preparation for simple gl element profiling
fix #1596 project metadata not saved
Merge branch 'develop' of git@github.com:Caleydo/caleydo-dev.git into develop
use cache within TreeClusterer for all vectors (a lot of memory but
faster)
Merge branch 'develop' of git@github.com:Caleydo/caleydo-dev.git into develop