[trunk] 2 issues with saved/non-saved score status

Setup: rev. 4729; Ubuntu 11.04, Qt SDK 1.1.3 (Qt lib 4.7.3)

Steps:

1) Open the attached sample score (just a single, empty measure for 1 instrument)
2) Press [PgDn]
3) The score is marked as unsaved (why?)
4) Optional: do a 'real' change (like adding a note)
5) Save it with either the hot key ([Ctrl][S]) or the menu command

Result: the score is still marked as unsaved (asterisk near the tab name) and trying to close it brings up the "Save changes to score?" msg box.

Expected results:

1) No-change operations like scrolling around should not mark the score as unsaved.
2) Saving the score should mark it as saved.