3 ehnahcements... for all versions

1) Sometimes there found midi file contains many empty measures at the end of score.

    Now, it shows those empty measures correctly.

2) Now creates scores correctly for 2/1 time signature (3/1, 4/1 ...)

3) When it tries to hide some tracks automatically due to screen orientation to landscape or note size change to bigger one,

it will try to hide non-highlighted tracks first, and then if there is no more non-highlighted one,

then will hide track from the last.