Updater: fix coding style

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Updater (cmd-line): clarify message about re-uploading obsolete files

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Updater: uploading a dependency *must not* cause mark it as missing

When uploading, we check for common conflicts. One such conflict is
when dependencies are not available on the update site. But if we
are about to upload said dependency, it is not missing...

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Updater: uploading an obsolete dependency *cannot* make it "missing"

When uploading, we check for common conflicts. One such conflict is
when dependencies are not available on the update site. But if we
are about to upload said dependency, even if it was marked obsolete
before, it is not missing...

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge branch 'upload-obsolete-files'

These fixes were required to (re-)upload obsolete files to the ImageJ
and the Fiji update site during the release of ImageJ 2.0.0 beta 7.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>