Add the physics constants to the ipython physics user configuration.

IPython/UserConfig/ipythonrc-physics

@@ -38,6 +38,8 b' ececute rad = pi/180.'
 execute print '*** q is an alias for PhysicalQuantityInteractive'
 execute print '*** g = 9.8 m/s^2 has been defined'
 execute print '*** rad = pi/180  has been defined'
+execute import ipy_constants as C
+execute print '*** C is the physical constants module'
 
 # Files to execute
 execfile