This is a bug and should be fixed:
The smartcard insertion detection does not work if we uncomment
the check. But on the other hand, pcscd detects a lot of erroneous
smartcard insertion and removal events.
Currently the smartcard insertion interrupt is always triggered,
but when checking in PIO_ISR which pin triggered the interrupt
often times DTXD is returned (the debug transmit line which is printing
debug messages at the moment..)
