re-add user last position saved
Cleaned up whitespace in layout algo classes. Tweaked spring layout
parameters. Overrode a method in the ISOMLayout so that it doesn't
randomize positions of vertices by default.
Enhanced DefaultLayout so that it positions unknown vertices by default at the
location of a neighboring vertex instead of at a random location. Added some
validation so that edges that are not connected to displayed vertices are omitted
from the graph.
Merge remote-tracking branch 'origin/1.12' into space/13.1-P2
Merge branch 'space/13.1-P2' into space/13.2
Merge branch 'space/13.2'

Conflicts:
	core/daemon/src/main/java/org/opennms/netmgt/vmmgr/DatabaseChecker.java
	core/schema/src/main/liquibase/changelog.xml
	features/acl/pom.xml
	opennms-provision/opennms-provisiond/src/main/java/org/opennms/netmgt/provision/service/PhysInterfaceTableTracker.java
	opennms-services/src/main/java/org/opennms/netmgt/threshd/ThresholdingSet.java
	opennms-webapp/src/main/java/org/opennms/web/rest/RequisitionAccessService.java