Minor feh(1) fixes/updates

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.It Cm -Z , --auto-zoom

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Zoom pictures to screen size in fullscreen

.Pq affected by Cm --stretch No and Cm --ignore-aspect .

Zoom pictures to screen size in fullscreen / fixed geometry mode.

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.It Cm -x , --borderless

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.It Cm -L , --customlist Ar format

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Use

Don't display images, print image info according to

.Ar format

.Pq printf-like string containing image info specifiers

for list output.  See

.Sx FORMAT SPECIFIERS .

instead.  See

.Sx FORMAT SPECIFIEDRS .

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.It Cm --cycle-once

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of 100, in which case images will always be shown at 100% zoom, no matter

their dimensions.

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.It Cm -g , --geometry Ar width No x Ar height

.It Cm -g , --geometry Ar width No x Ar height Op + Ar x No + Ar y

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Limit (and don't change) the window size.  Takes an X-style geometry

.Ar string

like 640x480.

Note that larger images will be zoomed out to fit but you can see them at 1:1

like 640x480 with optional +x+y window offset.

Note that larger images will be zoomed out to fit, but you can see them at 1:1

by clicking the zoom button.

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.It Cm -h , --help

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display help output and exit.

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.It Cm -Y , --hide-pointer

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Hide the pointer

.It Cm -B , --image-bg Ar style

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Use style as background for transparent image parts and the like.

Accepted values: white, black, default.

Accepted values: checks (default), white, black.

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.It Cm -i , --index

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