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Use broadcasting rules from ChainRules #89
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  This was referenced Sep 1, 2022 
      
          Codecov Report
 @@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   51.69%   55.54%   +3.84%     
==========================================
  Files          21       21              
  Lines        2124     2157      +33     
==========================================
+ Hits         1098     1198     +100     
+ Misses       1026      959      -67     
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           This mostly looks really good.  | 
    
              
                    oscardssmith
  
              
              approved these changes
              
                  
                    Sep 17, 2022 
                  
              
              
            
            
  
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This removes the reverse-mode broadcasting definitions here, in favour of the ones from ChainRules.
To make tests work, it also adjusts a few other rules, to add
unthunk, or handle trivial cases, or to ensurezero(x)is only called on arrays of numbers. Not all were required by the tests here, some were for testing some Flux models (and some are in JuliaDiff/ChainRules.jl#673). Test from #82 passes.All theMost of the second order tests fail. They fail before this PR, too.Built on top of #88, have not tested whether it would work without that.(rebased)Closes #53