Re-titled document.  Added VisaIOWarning.
Re-titled document.  Added VisaIOWarning.


git-svn-id: 9ab2475816adfb8420036182e3900ffc754382bd@100 516c0664-e049-0410-bc6e-8f9a6051a51d

rubund/debian-pyvisa,pyvisa/pyvisa,MatthieuDartiailh/pyvisa,hgrecco/pyvisa