Fix UpdaterTestUtils#show

Some directories changed...

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Updater: With WebDAV, upload sites do not need explicit upload directories

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
WebDAV uploader: fix UI

It displayed the wrong host, and it did not sport any meaningful
error messages when nothing could be uploaded.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Updater (Swing): do not ask before updating the updater

The user does not want to be bugged...

This resolves ticket #1659.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Updater: add some javadoc

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Updater: conflicts have a severity on a scale

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Updater: make 'install them all' non-conflicts

When there are dependencies that need to be installed, we'll just
treat them as messages, not conflicts.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge branch 'webdav-uploader'

This branch has a couple of fixes noticed when re-enabling the Fiji
update site (this time using WebDAV) and the fix to avoid asking the user
whether they want to update the updater.

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

Conflicts:
	core/updater/src/main/java/imagej/updater/core/Installer.java