Use pom-fiji as parent

This project is not updated often enough. So let's just depend on
the -SNAPSHOT version of pom-fiji so that at least yours truly has
a chance of fixing build issues in a timely fashion.

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

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