client/mysqldump.c:
  changed quotation mark around DECIMAL field values from " to '
  as fix of BUG #3361 "mysqldump quotes DECIMAL values"
mysql-test/r/mysqldump.result:
  added test for Bug #3361 "mysqldump quotes DECIMAL values"
mysql-test/t/mysqldump.test:
  added test for Bug #3361 "mysqldump quotes DECIMAL values"