Change doc error on MaxDensity
Added definition for MSVC compilation with gtest
Update ReleaseNotes.md
Started writing high level doc for datafilters
started box filter docu
more changes in datafilter
add a Tutorial page for the doc
Removed wrong assert
more doc and changed CMake for gtest
fixing assert in createSimilarEmpty
Merge branch 'master' of https://github.com/ethz-asl/libpointmatcher
continuing filters doc
small display fixes in datafilters.md