*********************
  loaddefs link  d_Qndfs  'arrays nested zByVal.ndf'  - operators for nested arrays
     these are alternate callBy[Value, Str] ops - [ary, nry, sub]Val, [idx, ndx]Str
        [Value, Str] suffixs are dropped within op definitions
        simpler for smaller [nry, sub], not for recursion etc, although I've retained what I did
     WARNING! use <opNam>_chkAppOp  for developments to [trap, report] errors
  +-----+
  Setup  
     Predefine local ops to avoid sequencing problems with initial qnial loaddefs  
  +-----+
  to (conversions) : mostly in 'arrays nested.ndf'
  nry_ndx_byValToLocal_nry_ndx_idx  IS OP  nryVal  ndxStr  - 
     conversion with [nryVal, ndxStr] output
  ndx_idx_byValLocalTo_ndx  IS OP  ndxLocalStr  idxLocal  - conversion
  nryShp_subShp_idx1stStr_get_bolFit  IS OP  nryShp  subShp  idx1stStr  - 
     l (true) if shape fits, o (false) otherwise
  +-----+
  get [itm, sub] ops 
  nry_ndx_byValGet_itm  IS OP  nryVal  ndxStr  - returns itm at ndxStr
  nry_itm_ndxInn_byValGet_ndxL_recurse  IS OP  nryVal  itmVal  ndxInnStr  - 
     ONLY for nry_itm_byValGet_ndxL!!
     recurse nry_itm_byValGet_ndxL in depth, returns OR[null (not found), ndxOut]
  nry_itm_byValGet_ndxL  IS OP  nryVal  itmVal  - returns OR(ndxL, faultL)  
     ndxL = all positions of itm in nry,  makes use of recursive search
  nry_sub_byValGet_ndx1stL  IS OP  nryVal  subVal  - ndxL of 1st item that "fits" in nested nry
     "current-depth-ONLY" version, uses ary_sub_valStrGet_idx1stL
     "across-depth-ONLY"  version has not been created yet 29Mar2024