It would be helpful to be able to run copyright update checks for previous years. It would therefor be required that update_copyright_year.sh not consider changesets which contain only copyright year updates as requiring another year update.

For example, if I run 'update_copyright_year.sh 2013' but commit during 2014, a changeset with those edits to the copyright date (and only copyright updates) would appear to a subsequent run of 'update_copyright_year.sh 2014' as requiring the year updated to 2014. Such changesets (only containing year updates) should be excluded by the script.