Initial EC_GROUP_new_curve_GFp implementation.

Rename 'EC_GROUP_set'-related functions to names similar to 'EC_GROUP_set_curve'
because they don't care about the generator.

Add new functions.

previous commit).

Add EC vaporware: change relevant Makefiles and add some empty source
files.

"make update".

The computations for which h was used can be done more efficiently
by using BN_rshift1.

Submitted by: Lenka Fibikova

use BN_CTX_start/get/end instead of accessing ctx->tos).

Change indentation to "EAY" style.

These new files will not be included literally in OpenSSL, but I intend
to integrate most of their contents.  Most file names will change,
and when the integration is done, the superfluous files will be deleted.

Submitted by: Lenka Fibikova <fibikova@exp-math.uni-essen.de>