Added manual for auditors!

Hey Paragon, I documented this here:

https://docs.krita.org/Maths_input

I used the code to figure out the possibilities, but it seems exp, ln and log10 don't work? Any idea why?

Feel free to edit the page yourself, btw, the login is the same as the phabricator one.

Cool, thank you.

I've done a few corrections (not that much) on the doc.

On my computer ln and exp functions work like a charm. But yes, there's a problem with log10 :S .
When I've got the problem corrected do I commit directly on master ?

It is string freeze now, so that means you can commit all sorts of bugfixes, except the ones that change strings.

If in doubt, make a small diff, and let @rempt or @dkazakov take a look.

For ln() and exp() could you add examples that do work? Maybe I am just not choosing the right numbers.

The procedure I use to test is to open an image then go to image size. To test the functions you need a doublespinbox (intspinboxes just do arithmetic) so just select percent as a unit. Then I write my formulas for example:

ln(2) the result is 0.6931, When I take the exp(0.6931) I get 1.9999 back (roundoff error, the true natural logarithm of 2 is irrational)
exp(50) gives 10000.0000 which is the maximal value on can put in the spinbox (exp(50) is bigger but the system prevent the spinbox to go over it's max).
exp(1) gives 2.7183 which are the first decimals of e.

If you take the log of a negative value the system will compute a NaN (the natural logarithm of a negative number is not defined on the Reals) so the spinbox should display an error.