* cardglue.c (open_card): Check USE_AGENT.
* g10.c (main): Option --debug-ccid-driver may now be given
several times increase the debug level.
* ccid-driver.c (parse_ccid_descriptor): Mark SCR335 FW version
5.14 as good.
(do_close_reader): Never do a reset. The caller should instead
make sure that the reader has been closed properly.  The new retry
code in ccid_slot_status will make sure that the readersatrts up
fine even if the last process didn't closed the USB connection
properly.
(ccid_get_atr): For certain readers try switching to ISO mode.
Thanks to Ludovic Rousseau for this hint and the magic numbers.
(print_command_failed): New.
(bulk_in): Use it here. Add new arg NO_DEBUG.
(ccid_slot_status): Disabled debugging.