This change allows creating new labels or setting to an old label a new
label config: copyAllScoresIfListOfFilesDidNotChange.
Labels that have this config set to true will copy all scores if the
list of files did not change. Renames count as the same file (= no file
change); as long as there are no explicit additions or deletions to the
list of files, the scores will be copied to the next patch-set.
Change-Id: I0051ea1236e6bd50a69455d799ce27081091d21a
bef260ec30