Now it's a commit

//TODO: add better messages in classes in packages server and supernode

//TODO: send all files to new supernode associated (when reconnect), instead of set hashtable as new
	  Can be done on method connetc in Client.java

//TODO: server answer disconnectionRefused when supernode is the last one in the network
Implemented (disconnectionRefused and preserve files uploaded):

Send all files to new supernode associated (when reconnect), instead of set hashtable as new

Server answer disconnectionRefused when supernode is the last one in the network

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//TODO: add better messages in classes in packages server and supernode