Work around Bio-Formats' broken dependencies more completely

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Saalfeld's mpicbg version 0.6.1 was finally deployed

So let's use that instead of the ad-hoc, unblessed "timestamp version".

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Update to latest parent POM

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