OCRmyPDF.sh: handling of path with spaces

- corrected fct absolutePath() to handle path with spaces correctly
- pdf title metadata: split on case change file name
- change of owner/group/permission removed from code
- improved logging
OCRmyPDF.sh: fixes #25 and fixes #26

- In debug mode: compute and echo time required for processing
- Resolutions (x/y) that are nearly equal are not supported (because the
test did not take into account imprecision due to trauncation)