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      Test of BCH encoder/decoder
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A two error case (should be corrected)
input=   [0 1 0 0 0 0 1 0 1 0 1 0 1 0 0 0 0 1 0 0 0]
encoded= [0 1 0 0 1 0 0 1 1 0 0 1 0 0 0 1 1 1 1 1 1 1 0 1 0 1 1 1 0 0 0]
err=     [0 0 1 0 1 0 0 1 1 0 0 1 0 0 0 1 1 1 1 1 1 1 0 1 0 1 1 1 0 0 0]
decoded= [0 1 0 0 0 0 1 0 1 0 1 0 1 0 0 0 0 1 0 0 0]
A three error case (will cause decoding errors)
input=   [1 1 1 0 0 1 0 0 0 1 0 0 0 1 1 1 0 0 1 0 0]
encoded= [1 1 1 1 1 1 0 0 1 1 0 1 0 0 1 1 1 0 0 1 0 1 0 0 1 1 1 1 1 0 0]
err=     [1 0 0 1 1 1 0 0 1 1 0 1 0 0 1 1 1 0 0 1 0 1 0 0 1 1 1 0 1 0 0]
decoded= [1 0 0 0 1 0 1 0 0 0 0 0 0 1 1 0 1 1 1 0 0]