Remove some files left over from development

[jlapeyre]

deleted:    dtest/byhand.jl
deleted:    dtest/dtest.jl
deleted:    dtest/lwcoeff.jl
deleted:    removewht.sh

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (8d38212) 92.02% compared to head (11cbbee) 92.02%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #29   +/-   ##
=======================================
  Coverage   92.02%   92.02%           
=======================================
  Files           1        1           
  Lines         188      188           
=======================================
  Hits          173      173           
  Misses         15       15           

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