Bring README up to date

Generate linux packages and windows build in release

Generated task with dot separator in its name should be able to ident…

…ify its parent task

Expand the environment in the expected value of a task requirement

Implement task requirements (exists, equals)

Update autocompletion instructions and scripts

Ensure that the parent tasks of the current task's dependencies are e…

…xecuted

Better handling of interrupt signal (let the currently executing acti…

…on react to the signal)

Fix absence of version info in ork executable

Do not allow an empty search term in cli