Histogram patch

Hello,

i'd like some feedback on
  http://naturbildforum.de/data/media/1/gqview-2.1.5-uwe.histogram.diff
especially whether or not it works for you.

The patch applies to gqview-2.1.5. Please ignore the fuzz message.

Short documentation:

This patch implements a histogram display in full screen mode.
Controls:

* I,i: Toggles between "no info", "small info", "info + histogram".
* K,k: Toggles between RGB, value, max value, red, green and blue modes.
* L,l: Toggles linear or logarithmical calculation.

For people subjected to older versions of this patch: if an image is 
still being loaded, only the short info without histogram will be shown, 
and this histogram will be shown later, as soon as possible.

I consider this almost ready for inclusion. It covers 100% of what i want
it to do, i just need to clean it up a bit.

Regards, Uwe

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