Add function parsing a TLS ECParameters record
Add functions for read/write ECPoint records
Supress 'format' argument to ecp_read_binary.

And adjust error codes for ecp_*_binary while at it.
Rename ecp_*_binary to ecp_point_*_binary
Add basic tests for ecp_tls_*_point
Add ecp_tls_write_group()
Fix ecp_tls_write_point's signature
Add tests for (and fix bug in) ecp_tls_write_group
Add a few tests for ecp_tls_read_point
Fix ecp_tls_read_group's signature
Fix ecp_tls_read_point's signature
Create ecdh_context structure
Add ecdh_make_server_params (untested yet)
Add ecdh_read_params().
Add ecdh_{make,read}_public()
Add ecdh_calc_secret()
Add a few check for context validity.