Make walsender options order-independent

Magnus Hagander <magnus@hagander.net>

Commit: e5487f65fdbd05716ade642a3ae1c5c6e85b6f22
Author: Magnus Hagander <magnus@hagander.net>
Date: 2011-01-23T22:39:18Z
Releases: 9.1.0
Make walsender options order-independent

While doing this, also move base backup options into
a struct instead of increasing the number of parameters
to multiple functions for each new option.

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