Re-organize progress engine functions.
Rewrite progress engine functions as following: Basic functions: (1) check_target_state: check to see if we can switch target state, issue synchronization messages if needed. (2) issue_ops_target: issue al pending operations to this target. (3) check_window_state: check to see if we can switch window state. (4) issue_ops_win: issue all pending operations on this window. Currently it internally calls check_target_state and issue_ops_target, it should be optimized in future. Progress making functions: (1) Make_progress_target: make progress on one target, which internally call check_target_state and issue_ops_target. (2) Make_progress_win: make progress on all targets on one window, which internally call check_window_state and issue_ops_win. (3) Make_progress_global: make progress on all windows, which internally call make_progress_win. No reviewer.
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