IJ Robot is an external plugin now

As of 1d894ba9(Mark the first commit of IJ Robot in its own repository) in
the IJ Robot source code repository at https://github.com/fiji/IJ_Robot
(which was generated from this commit's parent commit), IJ Robot is an
external core Fiji plugin.

Therefore, remove the now-obsolete source code from Fiji's source code.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Remove obsolete zs directory

Those sources have not been compiled for some time now. Apparently
they are not needed any longer.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add Vaa3d Writer as external plugin

This is the first external plugin that was developed using Maven
completely independently of Fiji. Nice.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge branch 'master' of github.com:fiji/fiji

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
MiniMaven is a standalone project now...

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