DSConnection fixes before meeting

Message trimming: 128kb instead of 128b (as described in pdf), now
defined by static const, corrected trimming (now uses arraycopy) and
traffic counter
Marked bug in '\r' skipping, discuss in meeting
Renamed main client class.
Reverted buggy \r handling.
Initial Basic Storage Server commit.
Implemented client KVStore (applies required interface to be used in client)
Initial protocol version and appropriate KVMessage classes PutResponse and GetResponse.
TODO:
	entire Server logic: multithreaded connection handling, synchronized dictionary storage
	client CLI: enhanced echoclient, remove send, add put/get
	clean out git file tree