#84 check if store() is called a second time

AdditonalMetaDataPanel.store() should only create one new
MetaData-CidsBean if next is pressed.
 #84 implemented AdditonalMetaDataContactInformationPanel
 #84 changed version of org-openide-dialogs

The update is needed because the method WizardDescriptor.doNextClick()
is needed.
 #84 buttons in MetaDataPanel work like next button

The Add and Edit buttons from the wizard panel AdditonalMetaDataPanel,
emulate now like clicking the next button in the wizard. To achieve this
their actionListeners must be replaced.
 #84 disable Add and Edit buttons if none selected

In MetaDataPanel the Add and Edit buttons are disabled if no MetaData is
selected in the table.
 #84 created first version of import panel

Created the first version of AdditonalMetaDataImportDocumentPanel.
Therefore the new panel BasicImportDocumentVisualPanel was created. This
panel is the basis for the other import panels.
 #84 do not create new contact in meta data panel

A new contact-CidsBean for the new MetaData-CidsBean does not need to be
created AdditonalMetaDataPanel. As it will be created in the contact
panel.
 #84 added a file drop listener

Added a inner class FileDropListener to BasicImportDocumentVisualPanel.
This listener was added to its import label.
 #84 enable import button

After a object was dropped in the panel, it is checked if the the object
is a readable file. If this is the case the import button will be
enabled. Otherwise it will be disabled.
 #84 created the SwingWorker CreateContent

The SwingWorker CreateContent is a inner class of
BasicImportDocumentVisualPanel. Its task is it to analyze the given file
and eventually upload its content. The upload is not yet implemented.
 #84 added WebDavHelper and uploadContent()

Implemented BasicImportDocumentVisualPanel.uploadContent()
 #84 fixed the non-working WebDav upload
 #84 show status when uploading a file
 #84 show the import status

In BasicImportDocumentVisualPanel when a file is imported the current
status is shown. (get content type, upload, finish)
 #84 configured AdditonalMetaDataEditDocumentPanel

Configured AdditonalMetaDataEditDocumentPanel and
AdditonalMetaDataEditDocumentVisualPanel, to do this a new wizard
property had to be added, which indicates if
AdditonalMetaDataImportDocumentPanel was already open.