Corrected the behavior of the "New External Folder" action, from the Working Copy view:
- the user input values are correctly parsed, and set in the proper order;
- the URL pointing to the external target and the name of the local target are escaped as necessary;
- the paths to local repositories, used as external targets, are properly converted to URLs (on Windows).
Fixed contextual menus that remained on the screen when the application did not have input focus (Mac OS).
Fixed error that occurred when loading a working copy which required an upgrade.