IJHacker: eliminate repeated ImageJ from version

Previously, the version string -- as returned by version() and in the
status bar -- showed "(Fiji Is Just) ImageJ/ImageJ" as a holdover from
when it was "Fiji/ImageJ". It made sense at the time but is now no
longer needed.

This change is mostly just an excuse for me to try out the new WebDAV
upload mechanism. ;-)
IJHacker: make title-related comments more accurate

With the change from "Fiji" to "(Fiji Is Just) ImageJ" they fell out of
date; this change brings them back in line with reality again.
.gitignore: add new Bio-Formats dependencies