- use complete -o filenames, dropped -o nospace to make it more responsive.
- restructure completion code to use a unified backend, which makes it easier
understand, maintain and re-use.
- foamCreateBashCompletions now simply outputs to a stdout, and allows
quick generation of completion of single applications.
- add -fileHandler completion in anticipation of future changes there.
- relocated as etc/config.s/bash_completion to prevent inadvertently
having two versions (.com, .org) installed at the same time.
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