trick solutation for get total account in YTA chain . it will remove when final soulation is ready. (The total accounts should hold on yta browser system)

add precision info

update seo code

add Debug information for test

unit-test for staking to other users (should not use pending refund), do not allow to delegate to self with transfer=true

sellram should only succeed if there is a guarantee that the user will at least get some tokens back after the fee is deducted

- fix unit tests that are affected by subjective disabling of deferred trx replacement
- Deferred trx RAM bug mitigation: subjectively disable deferred trx replacement for now.
- workaround deferred trx bug in system contract
- bill system contract refund trx to from not receiver

remove unused (but reserved) fields in eosiosystem::voter_info from ABI; add clarifying comments to system_contract::buyram fee logic

system contract bugfix: regproducer should always modify parameters (removed check if key is different) #3783