NTFS: Change how node entries are removed from indexes - instead of trying to promote a child, promote the next leaf instead.  Should fix a problem where unbalanced indexes could be created.
NTFS: Change how node entries are removed from indexes - instead of trying to promote a child, promote the next leaf instead.  Should fix a problem where unbalanced indexes could be created.

breezechen/DiscUtils,quamotion/discutils,breezechen/DiscUtils,drebrez/DiscUtils