LabPro USB support on Win32!

It works! Really! Now that libusb-win32 works (see elsewhere at sourceforge), the Vernier LabPro is now compatible with USB on Win32. To use it, first install libusb-win32 (the filter driver), per their instructions. Then, from this project's CVS, get LabPro_176.inf, and put it in the libusb-win32 bin/ folder. When you plug in a LabPro, and Windows asks for a driver, point it to this file, and it should install a stub driver correctly. Then, you need cygwin installed and copy cygwin/lib/cygwin1.dll into the pythonlabtools/data_acquisition folder (this is easier than figuring out paths). Also, download the binary of LabProUSBServer.exe and put it in the same place. Everything should work now. Someday, a distutils script will handle this.