Do not require auto-imports in Plugins>Examples>chess

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Avoid requiring auto-imports in Plugins>Examples>Delayed Snapshot

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Fix_Updater.js: optionally out out of adding the Fiji update site

The Fix_Updater.js script is available as
http://update.imagej.net/bootstrap.js and is the most convenient way to
bootstrap Fiji in, say, Jenkins jobs.

It is actually too usable not to allow bootstrapping ImageJ2 without the
Fiji plugins. So let's add an option to opt out from adding the Fiji
update site:

	jrunscript -Dskip.fiji=true bootstrap.js update-force-pristine

This change was made for Mark Tsuchida to assist in setting up an update
site for Micro-Manager: http://micro-manager.org/.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Fix_Updater.js: In command-line mode, reuse local .jar files

When the ImageJ update bootstrapper already

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Move the ImageJ update bootstrap.js script to imagej-updater

As per commit f131630dcbde5f7b3c64fe5bb1c993b0e97fa546 in
https://github.com/imagej/imagej-updater, the Javascript intended
to bootstrap or fix the ImageJ updater lives in the imagej-updater
project instead.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Move the script to update bootstrap.js' URLs into imagej-updater

As per 964b40ddd7d1791547f4ab5112616486c21a6601 in
https://github.com/imagej/imagej-updater, the script to update the URLs
in the ImageJ bootstrapper script lives in imagej-updater. A later
commit even merges that code into the bootstrap.js script itself.

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