Description of the main change in 2.3.6, so that users know whether or
not to update.
Symmetric "floating point numbers close" test. Simpler code.
Fixed docstring.
Added main changes in 2.3.6, so that users who care know… (they can stop handling limit cases of umath.pow(), for instance).
Shorter code (not sure if it is more readable, though).
Merge branch 'release'