Conzilla 2.2.3 released

[Hannes Ebner]

This is a maintenance release, fixing the following bugs:

* “Contexts” context menu was disabled when clicking for the first
time
* Shortcut and menu for closing a tab/contex-map did not work
* “Window”-view could not be closed via X-button in the window
frame
* “Save” button was always enabled
* HTTP implementation of RemoteStorage did not timeout properly
* Multithreaded loading of maps caused problems; it is optional
now and deactivated it by default
* Sindice client did not time out
* Metadata popup sometimes showed up beneath map elements
* Added menu to manually clear the container and metadata caches
* Content URLs did not open in a browser on newer MacOS systems

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