More method functions.

Some actual method functions (not enough yet to use the EC library, though),
including EC arithmetics derived from Lenka Fibikova's code (with some
additional optimizations).

The next bunch of vaporware.

Implement dispatcher for EC_GROUP and EC_POINT method functions.

Initial EC_GROUP_new_curve_GFp implementation.

Add yet another (still empty) source code file that I forgot.

Add more EC vaporware (empty source code files I missed in my
previous commit).