[openbox] Directional switching

[Ian Zimmerman]

Here's the final patch, for now.

I addressed your first point about initializing the new config
variables.  I left the other part as it was, for 2 reasons:

1. It still feels marginally more intuitive (for a config file author)
to have 2 parameters, even after sitting on it for a day.

2. I don't know XML Schema, and doing it with a fraction would require
some wrangling in rc.xsd.  The existing fractional element allows
"center" which is not applicable here.

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