POM: tweak repositories comment
POM: bump to pom-fiji 5.0

This updates to the latest SciJava software components.

It also uses release versions for all Fiji components.
POM: tidy up order of configuration blocks

Accomplished using:

    mvn tidy:pom
POM: bump to pom-fiji 5.0.2
Merge remote-tracking branch 'upstream/master'