A few changes in this release:
- enable buffering of communications with the SANE server (80c9980 and f0f7df3), this should reduce latency if you're on a slow network
- don't leave server communication stream in a bad state on authentication failures (3acb861 and c34b4f8)
- add the ability to set a socket timeout for SANE operations (aef3be5, thanks @rmath!)
- added missing constraint descriptions in OptionValueConstraintType (5eda181, thanks @krichter722!)
- filter options in the same way that scanimage.c does (a2d0dce)