Prepare code for the account snapshot

[bitphage]

https://github.com/GolosChain/golos/blob/master/libraries/chain/database.cpp#L2883

Golos snapshot: https://raw.githubusercontent.com/GolosChain/golos/master/share/golosd/snapshot5392323.json

Seems too redundant, think of just following fields:

• id
• name
• publickey
• shares

Anatoly Piskunov, [21.03.18 17:06]
суммарный shares в dynamic_global_property_object формировать из снапшота, увеличивая с каждым обработанным аккаунтом