[CREATE] Lens correction database

[Cyrille Berger]

Hi,

> Comments are still welcome, as the interface has not been frozen
> yet ;-) (hey, it's just a week since I started ;-).
First comment, it's just formating of the doc :D , it's easy to get lost 
between the C++ API and the C API, I was a little bit confused at first going 
from a C API then having C++ classes. Not a big deal.

But more important :)
Reading http://cs.ozerki.net/zap/lensfun/doc/structlfLens.html , what is the 
best way to get the lens calibration data ? I would have like to have a 
function which either return me the closest solution or an interpolation, 
instead going throught the list in CalibDistortion and pick the closest to 
the focal.

Other than that it sounds good.

-- 
Cyrille Berger