Change Details

``` This makes them consistent with other files and avoids reserved identifiers. ``` Applied to multiset and schnorr as well.

``` This makes them consistent with other files and avoids reserved identifiers. ``` Backport of [[https://github.com/bitcoin-core/secp256k1/pull/874 | secp256k1#874]] Applied to multiset and schnorr as well.

``` This makes them consistent with other files and avoids reserved identifiers. ``` Backport of [[https://github.com/bitcoin-core/secp256k1/pull/874 | secp256k1#874]] Applied to multiset and schnorr as well.