Remove warnings (serial version UID, unused, raw types, unchecked).
Minor changes to previous commit (avoid warnings).
Fix errors in previous commit.
Changed default connection type from dump to subscription
Fixed error when trying to retrieve empty graphs
[add] in InternalMetadata the commit fromnewRestGUI branch([fixed] bug
in the equalsForLinks method)
[add] in InMemoryIdentifier the commit fromnewRestGUI branch([fixed]
wrong method call in InMemoryIdentifier)
[fix] in equalsForLinks, when a deleteTimestamp is set return false
[add] new IfmapMarshaller to find double ResultItems
[change] UpdateService transform dump data in internal data
[change] DumpingService dump-depth to 1
Merge branch 'develope' into newRestGUI

Conflicts:
	dataservice/src/main/java/de/hshannover/f4/trust/visitmeta/dataservice/Application.java
	dataservice/src/main/java/de/hshannover/f4/trust/visitmeta/dataservice/internalDatatypes/InternalMetadata.java
	visualization/src/main/java/de/hshannover/f4/trust/visitmeta/graphDrawer/Piccolo2DPanel.java
	visualization/src/main/java/de/hshannover/f4/trust/visitmeta/graphDrawer/piccolo2d/NodeEventHandler.java
	visualization/src/main/java/de/hshannover/f4/trust/visitmeta/gui/MenuBar.java
	visualization/src/main/java/de/hshannover/f4/trust/visitmeta/gui/WindowSettings.java