dim_avg_n_Wrap and dim_avg_Wrap do not transfer all meta data

Hi,

I am using ncl 5.1.1 on CGD systems (copper) and I think dim_avg_Wrap,
in 5.1.1, no longer retains all the metadata in the derived variable.
This breaks the AMWG diagnostics as it is expecting units and long_name
attributes to be retained and it also doesn't work for the new
dim_avg_n_Wrap routine.
Thanks, Rich

*** Example code:
 
    printVarSummary(tmp)
    lhflx = dim_avg_Wrap (tmp)
     printVarSummary(lhflx)

*** Gives:

Variable: tmp
Type: float
Total Size: 55296 bytes
            13824 values
Number of Dimensions: 2
Dimensions and sizes: [lat | 96] x [lon | 144]
Coordinates:
            lat: [ -90..89.99999999999999]
            lon: [ 0..357.5]
Number Of Attributes: 5
  derive_op : (Lv+Lf)*qflx-Lf*(prect-precsc-precl)
  cell_method : time: mean
  long_name : Surf latent heat flux
  units : W/m~S~2~N~
  time : 149.8191795945168

Variable: lhflx
Type: float
Total Size: 384 bytes
            96 values
Number of Dimensions: 1
Dimensions and sizes: [lat | 96]
Coordinates:
            lat: [ -90..89.99999999999999]
Number Of Attributes: 1
  average_op_ncl : dim_avg over dimension(s): lon

-- 
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 Richard Neale - rneale_at_ucar.edu - http://www.cgd.ucar.edu/cms/rneale -
 Atmospheric Modelling & Predictability, CGD, NCAR =-=-=-=-=-=-=-=-=-=-
 P.O. Box 3000, Boulder, CO 80307-3000 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 Tel (303) 497-1380 Fax (303) 497-1324 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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