[trunk] Measures long 2/1 or more not cleared to measure rest

Setup: rev. 4850; Ubuntu 11.04, Qt SDK 1.1.3 (Qt lib 4.7.4)

Steps:

1) Create or open a score with a time signature of 4/2 (or equivalent: 8/4, 2/1, ...) or more
2) Select one or more measures
3) Clear the measure(s) ([Del])

Result: The measure(s) are not filled with measure rests but with the rest(s) needed to reach the actual measure duration (a breve rest or more).

This is inconvenient as there is not way to get the measure rest back (short of manually editing the .mscx file).

Note: The same happens while copying and pasting runs of notes including measure rests: in the pasted copy the measure rests are replaced with actual rests.

Analysis: This happens because function Score::setRest() (in file libmscore/edit.cpp) restricts the use of measure rests to measures shorter than a breve. The meaning of (or even the need for) such a restriction is not clear.

The attached patch simply removes the above restriction by commenting out a line of that function. Developers with greater familiarity with the code may check if this raises other non-obvious side effects.

Thanks,

M.