- sometimes the communication freezes, some packet does not
  reach the destination. can be proproduced with egate driver,
  cryptoflex card and opensc regression test init0004,6,
  but is not specific to these drivers and cards
- improve pc/sc detection
- error handling: use error codes everywhere
- pin verification via keypad
- ifdhandler should clear status file slot on exit
- openct-control init: debug messages to syslog
- rewrite USB layer, add native support for *BSD
  and MacOS X. Remove optional libusb dependency
- CCID driver
