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).
Merge branch 'release' into release_python2.3
Fixed test for Python < 2.5.
Merge branch 'release_python2.3' into master_python2.3