Add support for importing of metadata
RDFTreeCtrl: Handle model change events
MenuCtrl::askForFile: accept extensions filters
MenuCtrl::importMetaData: set ExtensionsFilters
Merge pull request #50 from asobolev/master

backbone for Query Tab

LGTM
MenuCtrl: use Opt.ofNullalbe for chooser results
MenuCtrl: askForFile takes a title param now

Make it more generic
MenuView: move "Import Metadata" to project menu

Also add trailing "..." to indicate it will open a dialog.
Merge pull request #49 from gicmo/md_import

Curde support for metadata import

LGTM
Merge pull request #53 from asobolev/master

First draft of query view components

LGTM
FileBrowser: stubs for view and ctrl
FileBrowser: BreadCrumb navigation and file service
FileBrowser: ListNavigation
FileBrowser: implementing FileAdapter and LocalFile
FileBrowser: Navigation update
Merge pull request #54 from mpsonntag/filebrowser

Filebrowser
Generic bread crumb navigation

This should fix #55.

This class is completely untested but should be merged in order to use it in the file browser.
Merge pull request #57 from stoewer/gndata-editor-55

Generic bread crumb navigation
FileBrowser: Unstyled favorites
FileBrowser: Replace previous navigation with BreadCrumbNav