Get rid of Magic number in the code

[MohitKAgnihotri]

At the moment, we are using a lot of magic numbers in the code. I would recommend that we start using Macro defines for these magic numbers. This would increase the readability and maintainability of the code.

[pcppcp]

Can you provide link to the files in which the magic numbers do occur?

[MohitKAgnihotri]

There are many examples but here are few to mention:

• address.c -- keccak_256(pubkey+1, 64, hash); -- memcpy(addr_out, hash+12, 20);
• sign.c -- function: eth_sign -- signature[64] = pby + 27;