#81 created TopicCollectionAdditionalTagsPanel

TopicCollectionAdditionalTagsPanel is panel with which the user can
choose the topic category and collection for a CidsBean. Furthermore he
can add additional tags to the CidsBean.
 #81 avoid NPE in changeListModelToSelectedTaggroup()

If the TopicCategoryAndKeywordsVisualPanel is added to the Netbeans GUI
editor an NPE is thrown in
AdditionalTagsPanel.changeListModelToSelectedTaggroup(). This NPE has to
be avoided.
 #81 new panel is now a InfoProvider

The new panel TopicCollectionAdditionalTagsPanel extends now
InfoProviderJPanel. Furthermore a combobox was renamed and some comments
were added.
 #81 new panel was added to other panels

The panel TopicCollectionAdditionalTagsPanel was added to the panels
TopicCategoryAndKeywordsVisualPanel and ResourceEditor.
 #81 renamed two panels
 #81 added new collection button

Added a new collection button to TopicCollectionAdditionalTagsPanel.
A CreateNewTagAction-action was added to this button.
 #81 jalopy
 #81 actually added the action to the button
 #81 removed the taggroup collection from additional tags

Removed the taggroup 'collection' from the additional tags panel in
TopicCollectionAdditionalTagsPanel.
 #81 removed further occurrences of the collection

Also removed the taggroup 'collection' from the additional tags panel in
RelationshipEditor and RepresentationEditor
Merge branch 'bug/81-collection-tag-added-to-wrong-field' into dev