The Convert Signed Integer to Decimal Text routine converts a
    signed integer to its decimal representation in an ASCII text
    string. This routine supports Fortran Iw and Iw.m output and
    BASIC output conversion.

    Format

      OTS$CVT_L_TI  varying-input-value

                    ,fixed-length-resultant-string

                    [,number-of-digits] [,input-value-size]

                    [,flags-value]