Turn the authenication popup into a real Place.

Turn the authenication popup into a real Place.

        * src/main/java/org/glom/web/client/place/HasTablePlace.java:
	Moved some of this into a base class:
        * src/main/java/org/glom/web/client/place/HasDocumentPlace.java:
	for use by:
	* src/main/java/org/glom/web/client/place/DocumentLoginPlace.java

	* src/main/java/org/glom/web/client/ui/AuthenticationPopup.java:
	Removed this, moving its UI into:
	* src/main/java/org/glom/web/client/ui/DocumentLoginView.java
	* src/main/java/org/glom/web/client/ui/DocumentLoginViewImpl.java

        * src/main/java/org/glom/web/client/ClientFactory.java:
        * src/main/java/org/glom/web/client/ClientFactoryImpl.java:
        Added getDocumentLoginView() to return this view.

        * src/main/java/org/glom/web/client/activity/HasTableActivity.java:
	Move some of this into a base class:
	* src/main/java/org/glom/web/client/activity/HasDocumentActivity.java
	checkAuthentication(): If the user is not authenticated,
	instead of showing the popup, go to the login place.
	* src/main/java/org/glom/web/client/activity/DocumentLoginActivity.java
	A new activity for the DocumentLoginPlace. This checks if the
	user is authenticated and either moves to the appropriate page or
	waits for the user to enter credentials.

        * src/main/java/org/glom/web/client/activity/ListActivity.java:
        * src/main/java/org/glom/web/client/activity/ReportActivity.java:
	Remove mentions of the authentication popup.

        * src/main/java/org/glom/web/client/mvp/AppPlaceHistoryMapper.java:
        Tell this about DocumentLoginPlace.
        * src/main/java/org/glom/web/client/mvp/DocumentSelectionActivityMapper.java:
        getActivity(): Also handle DocumentLoginPlace, returning DocumentLoginActivity.

	The login screen is not pretty, and it does not yet attempt to take the use
	back to the correct place.