2013/02/01 Initial version

This program was written due to the speed of some harddisk was too slow to
test network throughput on gigabit or faster ethernets. It is simple but does
the work.

Build environment: Code::Blocks 12.11 with built-in mingw32 (Windows version).
Run environment:   Windows 7 (other Windows should run, too).
Resource:          When running in server mode, it occupies TCP port 30000.
                   This is hard coded in source code.
License:           Simplified BSD
                   http://en.wikipedia.org/wiki/BSD_licenses#2-clause_license_.28.22Simplified_BSD_License.22_or_.22FreeBSD_License.22.29
Usage:            
                   To start a server:
                        lanspeed.exe s
                   To start a client:
                        lanspeed.exe c 127.0.0.1
                        
                        Change the IP 127.0.0.1 to the actual server's IP.