More changes coming out of the bignum auditing. BN_CTX_get() should ideally
return a "zero" bignum as BN_new() does - so reset 'top'. During BN_CTX_end(), released bignums should be consistent so enforce this in debug builds. Also, reduce the number of wasted BN_clear_free() calls from BN_CTX_end() (typically by 75% or so). Submitted by: Nils Larsch Reviewed by: Geoff Thorpe, Ulf Möller
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