Set the BS constant to be floating-point; this removes the need for floating point numbers when dividing it

Make Connection::Receive return the data via a SharedBuffer reference, so the caller doesn't have to choose the right buffer size in advance.

Conflicts:

	src/test.cpp

utility.h: Change Buffer's interface to be more compatible with SharedBuffer's interface, connection.h: use Buffer instead of SharedBuffer in command and event queues

Add new Connection test in test.cpp in case needed in the future (commented out), improve comments in test.cpp a bit