* some minor hacking of the login progress to improve performance
* expanded the application exit sync dialog to be a general modal sync dialog that will display whenever appropriate (e.g. during initial setup, on manual "sync now" requests, and on application exit)
* added a progress meter and status messages to the modal sync dialog to provide users with a better understanding of what's going on, and to assist in debugging
* added ability to cancel a modal sync request, including on application exit. when cancel is clicked on by the user, it will attempt to cancel the sync at the next opportunity (i.e. before the next sync engine is processed)
- Minor reorganization of preferences, namely, moving the advanced debugging tools into a sub-dialog and ensure each have a descriptive confirmation prompt.
- we are also changing the default preferences on the trunk to point to the new staging server at https://sm-labs01.mozilla.org:81 that has been modified to support usernames
- everyone will need to create a new account and this will be streamlined within the startup function, which will now kick off on first run (we'll check in the updated setup wizard shortly)
- this checkin also cleans up a number of strings
