Move BIGNUMs in EC_GROUP and EC_POINT to the heapHEADmastercvs/HEAD

The only way to get an EC_GROUP or an EC_POINT is by calling the relevant
_new() function and to get rid of it, something must call _free(). Thus we
can establish the invariant that every group has Weierstrass coefficients
p, a, b as well as order and cofactor hanging off it. Similarly, Every
point has allocated BIGNUMs for its Jacobian projective coordinates.

Unfortunately, a group has the generator as an optional component in
addition to seed and montgomery context/one (where optionality makes
more sense).

This is a mostly mechanical diff and only drops a few silly comments and
a couple of unnecessary NULL checks since in our part of the wrold the
word invariant has a meaning.

This should also appease Coverity who likes to throw fits at calling
BN_free() for BIGNUM on the stack (yes, this is actually a thing).

ok jsing

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