At least one of the derivatives of the incomplete elliptic integral of the third kind elliptic_pi is known. Please implement it.
See http://dlmf.nist.gov/19.4 DLMF equation 19.7.4. Note that maxima function definition differs from DLMF.
functions.wolfram.com uses the same definitions as maxima, and gives expressions for derivatives.
Implemented by Commit [106c95]
https://sourceforge.net/p/maxima/code/ci/106c95d399dd6ba40b413ee1d97a012e1473f62f/
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Commit: [106c95]