removed repository declaration in sub-pom
Fix duplicate column definition.
Merge remote-tracking branch 'upstream/develop' into develop

* upstream/develop:
  Fix duplicate column definition.
speed up build by fetching SCM revision only once
fixed OGC logo URL in footer
Merge branch 'develop' into fix/java8-compability

* develop:
  fixed OGC logo URL in footer
  speed up build by fetching SCM revision only once
  Fix duplicate column definition.
  removed repository declaration in sub-pom
override XPathFactory implementation for SAXON

see https://saxonica.plan.io/issues/1944