Add newsitem for the two new unittest methods.

Also, made some whitespace cleanup.

Misc/NEWS

@@ -437,6 +437,12 @@ Extension modules
 Library
 -------
 
+- unittest.py now has two additional methods called assertAlmostEqual()
+  and failIfAlmostEqual().  They implement an approximate comparision
+  by rounding the difference between the two arguments and comparing
+  the result to zero.  Approximate comparision is essential for
+  unit tests of floating point results.
+
 - calendar.py now depends on the new datetime module rather than
   the time module.  As a result, the range of allowable dates
   has been increased.