Allow specifying relative DFS index for focus command #682
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I also wanted dfs next/prev as discussed in #248.
I figured I could implement without adding additional flags or breaking backwards compatibility by having the parser look for an optional +/- suffix on the existing dfs-index argument. The next/previous behavior can be had via:
focus --dfs-index +1
focus --dfs-index -1
respectively.
As with my other PR, I haven't implemented any automated tests around this but would be happy to look into doing so if desired.