New upstream version
    
    - Add a session helper that can be used to calibrate the screen
    - Add some defines for the Spyder4 display colorimeter
    - Add support for reading and writing .cal files to CdIt8
    - Add the ability to 'disable' a device from a color POV
    - Create ICCv2 profiles when using cd-create-profile
    - Use enumerated error values in the client library
    - Use spotread when there is no native sensor driver