change first 101 delegegates returned by blockchain_list_delegates from active to top(fixed #360)
update last_unlock_scanned_block_number when fork and pop block happens during wallet lock, fixed #148
merge from upstream/master
merge from upstream/master
merge with upstream/master
Merge pull request #374 from HackFisher/master

update last_unlock_scanned_block_number when fork and pop block happe