code: FormatStep reserve(int reserved) {
  
          return new FormatStep(
              this.processor,
              this.level,
              this.section,
              this.sectionalAttrs,
              null, // called before build of formatter
              this.reserved + reserved,
              this.padLeft,
              this.padRight,
              this.orMarker,
              this.lastOrBlockIndex
          );
  
      }
docs: <p>Rechnet die angegebene Anzahl der zu reservierenden Zeichen
  hinzu. </p>
  
  @param   reserved    count of chars to be reserved
  @return  updated format step