added a two-cell list rendering to the query panel
Merge pull request #61 from asobolev/master

added a two-cell list rendering to the query panel

OK
Merge pull request #60 from stoewer/gndata-editor-56-metabrowse

First draft of the metadata browseer
Resources: utils and comparators
VisualItem: mark as deprecated
Resources: fix bugs
ResourceAdapter: refactor and use utilities of Resources
Resources: handle reverse relations
MainView.fxml: use empty tag
SimpleModelChangeHandler: moved to own class
RDFTree: tree is no longer used

Most of the functionality used inside is now available from Resources utilities.
VisualItem: not longer used.

Functionality is available on Resources utilities.
Merge branch 'master' into refactoring

Conflicts:
	src/main/java/gndata/app/ui/metadata/tree/RDFTreeCell.java
	src/main/java/gndata/app/ui/metadata/tree/RDFTreeItem.java
	src/main/java/gndata/app/ui/util/RDFVisualItem.java
	src/test/java/gndata/app/ui/metadata/RDFVisualItemTest.java
Resources: fix NPE in toNameString()
ListPanel: refactoring and use of Resources utilities
Merge pull request #64 from stoewer/refactoring

Clean-up and refactoring
Tables: refactoring of table items

Things that still need to be done
* Replace usage of deprecated methods
* Remove deprecated methods
Merge pull request #65 from stoewer/refactoring

Tables: refactoring of table items
TogglePane: parent component for ui switching
MetadataBrowser: toggle between search and nav

However, the search field is not functional for now.