common: extend API of openpgp_oid_to_curve for canonical name.
* common/openpgp-oid.c (openpgp_oid_to_curve): Add CANON argument. * common/util.h: Update. * g10/import.c (transfer_secret_keys): Follow the change. * g10/keyid.c (pubkey_string): Likewise. * g10/keylist.c (list_keyblock_print, list_keyblock_colon): Likewise. * parse-packet.c (parse_key): Likewise. * scd/app-openpgp.c (send_key_attr, get_public_key): Likewise.
Change the function so that caller can select canonical name of curve
or name for printing. Suggested by wk.