unwindSection using RepeatList as how a human will notate the volta: using the n-th time a startRepeat is taken, also slightly modified the jump detection logic to have it check for jumps only upon the last passage of a measure
Each section is unwound individually. A giant album should have same repeat list as concatenation of repeatlists from individual scores (provided each score only refered to markers in its score).
Partitions score by section breaks, and is now aware about section breaks occuring on non-measure MeasureBase objects such as horizontal/vertical frames (repeat37 test).
