Switching to OpalKelly::FrontPanelDevices

The device enumeration methods and OpenBySerial that used to be available on the main device class have been removed. New code should use the OpalKelly::FrontPanelDevices class instead.

For example, the old style code to open the first connected device:

okCFrontPanel* xem = new okCFrontPanel;
if (xem->OpenBySerial() != okCFrontPanel::NoError) {
    ... handle the error ...
    delete xem;
    return;
}
... use the device, e.g. call xem->ConfigureFPGA() ...
delete xem;

can be replaced with

OpalKelly::FrontPanelDevices devices;
OpalKelly::FrontPanelPtr xem = devices.Open();
if (!xem) {
    ... handle the error ...
    return;
}
... use the device, e.g. call xem->ConfigureFPGA() ...

Notice that there is no need to explicitly call

delete xem 

any more and that it is also possible to work with remote devices, via FPOIP, when using the new API, while the old API is limited to local devices only.