Add some method to manage db conn resources.

Start database develop

Change message structure, Add an kick client method for plain client who want to connect to SSL port, or bad client send bad messages

set how many thread will be created for ssl trans, how many for plain trans,
client use ssl can communicate with plain client as well

Add openssl cert build basic execuables in windows 7, for convient

connections Established  between node 2 node. however, p2p can only take effect when both of them logged on a same server-process

Now, the deal method simplay send message back to where it came from.

do not use Upper case chars in include filenames, which will cause file not found in unix-lke systems

Signals and slots in Qt does not need moveToThread , so, it is very convient to emit cross-thread signals.

Add an method to cancel all tasks belonging to the closing-client, avoiding bad pointer operation in different thread.

use std::bind, because this method can not provide correct moveToThread() support