Feature Request: Implement Durand HDR algorithm

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What steps will reproduce the problem?
1. Open photivo
2. Try to do realistic tone-mapping of HDR RAW file.
3. Get sad by the results with Fattal :(
4. Read http://www.frank-durr.de/tonemapping_comparison.html
5. Realize that Durand does seem like the best for most* cases after trying his 
software with my images.
6. Read Durand et al's explanation of the algorithm: 
http://people.csail.mit.edu/fredo/PUBLI/Siggraph2002/
7. Realize that photivo is already using Bilateral filters everywhere.
8. Decide that it's worth creating a new feature request :)

What is the expected output? What do you see instead?

1. Open photivo
2. Try to do realistic tone-mapping.
3. Be happy with the results.

What version of the product are you using? On what operating system?

A Mar 26th build from the repo... but I doubt it's been implemented yet anyway.

Please provide any additional information below.

It seems that is just a matter of using BF to separate low and high frequencies 
in a logarithmic space of the L channel, apply a simple contrast reduction on 
the low frequency (multiply by some factor), and reconstruct the image back 
into linear after adding the low and high freqs.

Is also worth reading: http://people.csail.mit.edu/sparis/bf/

Original issue reported on code.google.com by [email protected] on 8 Jun 2013 at 9:12