Change Log 5.7.4

• core client: put if() around "compute_work_request(): start" msg
• MGR: Add "Anytime" to the list of start times for the simple preferences dialog.
• MGR: Fix instructions when a connection failure happens.
• MGR: Let the core client manage the snooze timer. Changes for both the advanced gui and simple gui.
• MGR: Handle the clear preferences case better by setting the mask flags to false instead of just calling set preferences override with an empty string.
• MGR: Make sure we grab the correct localized dialog name during construction.
• MGR: Revamp the messages dialog so that it is resizable.
• MGR: Remember the size of the various message columns.
• MGR: Remember the size of the dialog.
• MGR: Add clipboard functionality.
• MGR: Cleanup code in various other places.
• MGR: Change points to credits.