Add method to initialize static data of the fragment
(Google account & Dropbox key/secret in shared prefs)
Avoid re-launch Drive authentication request activity
(if previous request failed; e.g. when user refuses)
Fix bug: create new VPathAdapter with current path, not default one
Fix bug: consideration for uninitialized fragments in setStorageOption (e.g. adapter might be null)
Set up paths in onCreate, set up buttons in onCreateView
Add code to debug storage state i.e. latest paths for each storage option & current storage option
Fix bug: must make SUPPORT_* public
Fix bug: pre-emptive exit when savedInstanceState == null in onCreate
Fix bug: must do set up paths after restoring from state
Fix bug: must not overwrite client's initial paths with previously shown paths