S3 : line continuation

Line continuation should use an ampersand both at the end of lines to be continued and at the start of the next line.

Good line continuation

 CALL ROUTINE_WITH_VERY_LONG_AND_BORING_NAME ( IVAL1,IVAL2,IVAL3, &
  &    PVAL_1,PVAL2,PVAL3, &
  &    LDVAL1,LDVAL2)

Bad line continuation

 CALL ROUTINE_WITH_VERY_LONG_AND_BORING_NAME ( IVAL1,IVAL2,IVAL3, &
       PVAL_1,PVAL2,PVAL3, &
       LDVAL1,LDVAL2)