Bio-Rad Gel: add explanatory comment
SIS: enforce TIFF suffix

...to prevent the SIS reader from picking up .vsi data.
Merge pull request #477 from melissalinkert/rebased/dev_4_4/fiji-523

Zeiss CZI: parse Z positions from XML (rebased onto dev_4_4)
Merge pull request #478 from melissalinkert/april-bug-week

Final 4.4.7 bug fixes
Merge pull request #379 from sbesson/logging_docfix

Fix source code links moved to the scifio-tools foder