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= Final Pynac Switchover Push for Sage-4.0 =

 * _pow_ in number_field_element and _rational_ has some hacks since the Pynac library will cause infinite recursions.
 
 * Handling of fderivatives so that we can convert to Maxima.

 * There's a lot of "grunt work" to be done to fix doctests to work with the new output format.
In each case somebody has to verify that the two things are equal.

 * The massive speed regressions, making pynac symbolics *slower* than Maxima for some benchmarks.

 * The current handling of I as a wrapper around a number field element is a bit awkward since (I+2)*x can't be expanded as I+2 is "atomic". This also means that I.imag() returns 1.0 instead of 1. This causes issues in algebraic.