Log Message:
Update to 1.2.2:
    - New build system for Windows; support for DLLs.
    - Imath: Removed TMatrix<T> classes; these classes are still
      under development and are too difficult to keep in sync
      with OpenEXR CVS.
    - IlmImf: support for image layers in ChannelList.
    - IlmImf: added isComplete() method to file classes to check
      whether a file is complete.
    - IlmImf: exposed staticInitialize() in ImfHeader.h in
      order to allow thread-safe library initialization in
      multithreaded applications.
    - IlmImf: New "time code" standard attribute.
    - exrdisplay: support for displaying wrap-around texture map
      images.
    - exrmaketiled: can now specify wrap mode.
    - IlmImf: New "wrapmodes" standard attribute to indicate
      extrapolation mode for mipmaps and ripmaps.
    - IlmImf: New "key code" standard attribute to identify motion
      picture film frames.