[fix] Fix bugs and rename variables
- To be able to fit a line, the neighborhood must contain at least 2 points (unlike the 0 min as before), this lead to segfault errors when 1 only neighbor was detected.
- This MR contains some renaming to be more consistent.
- The invalidation step did not process all points and some non wanted keypoints appeared.
@nicolas.cadart PTAL
Edited by Julia Sanchez