add sample data for closest_neighbours tool
add sample data for inter-spot distance calculation
move filament test files to sample data dir
better sample data without singular branches
new (slightly bigger) small sample dataset
modify testdata: new id for closest, more references

1) file with reference coords contains now 4 spots
2) closest neighbour for ref[0] is now cand[17]
add manually created filament sample data
move first point to last position
shifting point 0 and 3 a bit
remove outlier that messed up greedy path calculation
Merge branch 'master' into history