improve comparison of slurs in merge2core.xsl #14
Description
Right now, ambiguous slurs which may start in measure n or n+1 are not recognized as the same slur in a different source when they clearly start in measure n+1 there. This could be improved by comparing slurs not measure-wise, but mdiv-wise, adding an additional @start.measure (with the measure's @n) to the comparison element.
Won't be fixed soon, as the situation is not relevant for the Freischütz (according to @JoachimIffland)