Updating man page for new geometry options

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.Pp

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For the

.Cm --bg-center

and

.Cm --bg-max

options, you can use the

.Cm --geometry

option to specify an offset from one side of the screen instead of

centering the image.  Positive values will offset from the left/top

side, negative values from the bottom/right.  +0 and -0 are both

valid and distinct values.

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.Pp

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Note that all options except

.Cm --bg-tile

support Xinerama.

For instance, if you have multiple screens connected and use e.g.

.Cm --bg-center ,

.Nm

will center the image on each screen.

will center or appropriately offset the image on each screen.

You may even specify more than one file, in that case, the first file is set

on screen 0, the second on screen 1, and so on.

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