Example for Powell function in auglag example incorrect

[aadler]

While working on changing the direction of the inequalities, I noticed that the Powell example is incorrect, as it is assuming each of the equality constraints directly equal 0, whereas in the example in Rsolnp, they are (10, 0, -1). I will fix this as I progress, but noting here for reference. If we accept the general "change of inequality" PR, this will be fixed. Otherwise, I can submit a smaller PR fixing it.

[astamm]

Excellent, thanks @aadler. I agree with the common change of inequality sign. So your wip should fix many of the currently opened issues!

[astamm]

Should be fixed in #157 thanks to @aadler .