Fix #326: Remove Channel::getInput/OutputFrames
Update CHANGES for last commit
Fix context sharing for transfer window
Merge pull request #329 from tribal-tec/master

Fix context sharing for transfer window
Merge pull request #328 from eile/master

Fix #326: Remove Channel::getInput/OutputFrames
Fix readback and assemble frames (#326)
Replace deprecated ICommand funcs, minor cleanups
Serialize image into command for transmit