docs: function checkFolder(ffs, fld) {
      let fldBits = fld.split('/'), mkfld = '';
      fldBits.forEach(toBit => {
          mkfld = mkfld ? mkfld + '/' + toBit : toBit;
          if (mkfld && !ffs.existsSync(mkfld)) {
              ffs.mkdirSync(mkfld);
          }
      });
  }