Fixes for upcoming SymPy 1.4 #948
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Previously, these were printed as "-x + 1" which isn't as nice. We need to protect the doctests by version, but they will pass on master (and thus with the next release).
In some cases we need to XFAIL instead b/c the result of the test is used in a later test.
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Many thanks to @nickovs upstream in sympy/sympy#15985, we now print -x + 1 as 1 - x which looks much nicer in many places. This requires some doctest updates.
A few other updates based on upstream changes for the upcoming SymPy 1.4.