message checksum between nodes with 0.2.9 or higher, optimization level up from -O0 to -O2, rpc functions: setlabel, getlabel, getaddressesbylabel, getreceivedbyaddress, getreceivedbylabel, listreceivedbyaddress, listreceivedbylabel -- version 0.2.9
-- version 0.2.8
split init and shutdown from ui.cpp into init.cpp, support wxUSE_GUI=0 -- version 0.2.7