feat(editor): the editor knows which tracks have their grade line fitted: a grade line applied, fitted to the terrain model or with the profile, marks its tracks with the shape they have, kept in the scenery files as //$f lines; a track changed since, by hand, by K or taken back, isn't fitted any more. The terrain of the tracks in the panel of the tracks tells how many of the selected ones are fitted, and puts onto the terrain all the tracks or only the ones not fitted, these meeting the fitted ones as they are, the scenery not moved

Selftests: nmtauto [unfitted], fittedstate [reload].

application/editormodeselftest.cpp

@@ -157,6 +157,8 @@ editor_mode::selftest_result editor_mode::selftest_dispatch(std::string const &c
 //                                        with the timings and counts of the renderer
 //   fittime <metres>...                  the grade line of a straight over rolling ground of each length fitted, as at a click, and the time the
 //                                        frame waits for it while the track is laid, the line fitted on the thread of the fitter
+//   nmtauto [unfitted]                   the tracks put onto the terrain model, all or the ones whose grade line isn't fitted yet
+//   fittedstate [reload]                 logs how many tracks have their grade line fitted, and which; reload: read again from the //$f lines
 //   trackterrain <pull|restore> <track>...   the terrain drawn to the tracks, or their formations taken out of it, as the panel of the tracks
 //   terrainhash                          a hash of the heights of the terrain chunks in memory, to compare the ground two builds made
 //   rebuildall                           the geometry of every path in the sections made already laid anew, the time it took logged,