eu07 now finds files whatever the case of their names on Linux too
(MaSzyna-EU07/maszyna#362), so the starter no longer folds an include or a
scenery's .sbt to lower case to judge whether the simulator opens it: it
looks them up through CaseInsensitivePaths. The IncludeLetterCase fault and
its texts go, being a false alarm now, and the parser takes a plain yes or
no for each include.
Saves keep comments and every byte they do not change. Faults in a scenery's
text are found and described. Files that change while the starter runs are
picked up without a manual reload.