Bump parent to 2.50

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Bump VIB-lib to first release version

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Bump VIB to first release version

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