Log Message:
Version 2.4.0 (released 2013-07-21)

* liboath: Add new API methods for validating TOTP OTPs
  The new methods (oath_totp_validate3 and oath_totp_validate3_callback)
  introduce a new parameter *otp_counter, which is set to the actual
  counter used to calculate the OTP (unless it is a NULL pointer). This
  allows for easier OTP replay detection in applications using liboath.
  Patch from Fabian Grünbichler <fabian.gruenbichler@tuwien.ac.at>.

Version 2.2.0 (released 2013-07-07)

* libpskc: Add functions for setting PSKC data.
  The new functions are pskc_add_keypackage and all pskc_set_* functions
  (see libpskc/include/pskc/keypackage.h).  This allow you to write
  programs that generate new PSKC structures.
* liboath: Permit different passwords for different tokens for the same user.
  Thanks to Christian Hesse <list@eworm.de>.
* build: Improve building from git with most recent automake and gengetopt.
  Thanks to Christian Hesse <list@eworm.de>.
* build: Valgrind is not enabled by default.
  It causes too much false positives.  For developers who want, use
  --enable-valgrind-tests.  It is still enabled by default when building
  from the version controlled sources (see cfg.mk).  Thanks to Christian
  Hesse <list@eworm.de>.
* liboath: Make header file usable from C++ (extern "C" guard).
  Reported by Alan Markus <alan.markus@gmail.com>.