Add support for floor == -1 DETX bug

Some older DETX files have -1 for each floor. This MR introduces a workaround which determines the floor number by counting up for each string, assuming that everything is sorted.

added backward compatibility label

added 1 commit

• e400a346 - Add tests for floor-1 bug

Compare with previous version

enabled an automatic merge when the pipeline for e400a346 succeeds

mentioned in commit 83525f42

merged