Resolve "Separate (external) interfaces form implementation for MeshModel"

Closes #25

See merge request grp-fidentis/analyst2!17

Code adapted to new API of the MeshModel. Weird usage MeshPoints replaced with using Vector3d. Additional refactorig would be helpful

Issue10

See merge request grp-fidentis/analyst2!13

# Conflicts:
#   MeshModel/pom.xml

Issue21

See merge request grp-fidentis/analyst2!12

Added dependencies on org-openide-* so that annotated action listeners can be used. Demo listener added as well.