Posting bw penalty fn is linear instead of quadratic

[zxcat]

In Golos author's reward weight calculated as:

reward_weight = uint16_t(std::min(
    (STEEMIT_POST_WEIGHT_CONSTANT * STEEMIT_100_PERCENT) / (pb.value * pb.value),
    uint64_t(STEEMIT_100_PERCENT)));

(STEEMIT_POST_WEIGHT_CONSTANT is 400%² = cutoff²)

In posting smart-contract we have linear dependency: https://github.com/GolosChain/golos.contracts/blob/d12b194da94eb67b3c9f286c59d21c0d34d5a24c/golos.publication/golos.publication.cpp#L908-L910

[kudzinp]

#688

[kudzinp]

• create accounts
• set params
• open balances
• add funds
• set rules
• set limits
• create mssg
• check reward weight
• create one more mssg
• check that reward weight was changed
• create more mssgs
• check that reward weight wasn't changed after reaching cutoff value

@s-medvedev

[zxcat]

@DedbaradeD, it works differently. Reward weight should change when you reach cutoff and should not if charge is less than cutoff.
Details: the default cutoff used in testnet is 400%, each "create-post" costs 100%, and battery restores min(current_charge, current_charge*time_since_last_use/24h).
So you can create 4 posts in a row without penalty and with 100% reward weight. Note: there is other limit, restricting time between 2 posts to 5 minutes by default.
The 5th post will have greater charge than cutoff, and at this point penalty applied (calcrwrdwt called), and reward weight will be less than 100%.