[mod] #364: Get rid of update_copyright_year.sh which becomes useless

update_copyright_year.sh

-#!/bin/fish
-
-# Script to update the copyright year in header files
-
-set NEW_YEAR (date +"%Y")
-set OLD_YEAR (math $NEW_YEAR - 1)
-sed -i "s/Copyright  2016-$OLD_YEAR M/Copyright  2016-$NEW_YEAR M/g" silkaj/*.py tests/*.py