Add pushlogin to login without scan qrcode
Fix long contact fetch bug & new protocol of adding friends
Fix contact spelling bug & fix None assignment bug [BR#226: cubesky]
Fix bugs of search_friends and test_connect
Clear useless loggings
Update user warnings
Fix bugs caused by strange contact return values [PR#208: lostdragon]
Fix sliced file upload bug
Fix chatroom member contact no deletion bug [qq: 123]
Fix friend update bug [BR#187: anderson916]