Add test for issue 3400
Evaluate more terms for Laurent power series.  Fix issue 2555.
Add test for issue 2555
Add test for issue 2826
Use Piecewise in manualintegrate (issue 3647)
manualintegrate checks assumptions on symbols
Don't cache integral results in case assumptions change
manualintegrate: check symbol assumptions in u-substitution as well
manualintegrate: add piecewise arctangent integrals
Add _eval_nseries method for expint()
Some tests for expint series
Make satisfiable() work with arbitrary expressions, not just Symbols

This is in the same spirit as https://github.com/sympy/sympy/pull/2451.

This also should make satisfiable() more deterministic by sorting the symbols.
Fix spelling error in function name
Define all the __rop__ logical operators on Boolean

Now things like True & x work.
Merge branch 'master' into logo
Add makefile deps on src/logo/sympy.svg
Fix typo
Add note about fonts
Fix docs about logo target
Reorder stuff about fonts