Added warnings.
Added warnings.


git-svn-id: 9ab2475816adfb8420036182e3900ffc754382bd@95 516c0664-e049-0410-bc6e-8f9a6051a51d

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