Added cloneRange function that creates a modifiable copy of range.
Added spannerMapCopy function that creates a modifiable copy of the score spanner map.
Fixed ottava copy constructor to include style data
Changed tremolo clone
Changed two-note tremolo copy-paste.
Fix for paste of 2 note tremolo that will not fit into bar.
Added tests for 2 note tremolo copy paste
Merge pull request #1030 from BartlomiejLewandowski/2-note-tremolo-copy-paste

2 note tremolo copy paste