Fixes #15

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See #15 for description of the issue.

The simplest solution seemed to be to allow to combine -c (clear) with other -a (alter) arguments in a flicker-free manner.

Because this adds new functionality by extending the semantics of argument interaction (without introducing any new nor removing any arguments though), I have bumped xcalib version to proliferate into all repositories.

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@beku feel free to review. Thanks!

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A friendly ping 😉.

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@beku glad to see you are back! I will leverage this exceptional moment and bring up 2 topics:

1. Would you consider giving multiple people the ownership access to the OpenICC organization on GitHub to increase the bus factor?

2. Would you please find a few minutes of your precious time to take a look at this minimalistic PR (adding basically only ~2 lines of new logic - the rest is just minimal shuffling with existing code)?

Many thanks for this great project!