pgmm: fix one-step covariance matrix #62
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…ano/Bond (1991), table 4, cols a1, a2); adjust vcovHC.pgmm accordingly (to make use of fixed non-robust covariance matrix) and declutter vcovHC.pgmm's code; add more test cases
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now replicates Arellano/Bond (1991) table 4, columns a1, a2