Change the logic for logging in with profiles

This includes a major refactoring of WorkspaceView that was necessary to
handle more connection states.  In particular, we have to support the
situation in which no profile is selected, so it is not clear what to
connect to.

Author: pieterhijma

LoginWidget.ui

@@ -96,7 +96,8 @@ def __init__(self, workspaceDict, **kwargs):
         self._id = workspaceDict["_id"]
 
         self.name = workspaceDict["name"]
-        self.path = CACHE_PATH + self._id
+        profile_path = Utils.joinPath(CACHE_PATH, kwargs.get("profile_name", ""))
+        self.path = Utils.joinPath(profile_path, self._id)
         self.subPath = kwargs.get("subPath", "")
         self.files = []