I am cleaning up some of the code in ticker.ScalarFormatter, specifically some 
of the text formatting for dealing with scientific notation. 

We provide an option to format labels in sci. notation without using mathtext 
or usetex, in which case I would like to use the unicode multiplication sign, 
× instead of x. Is there any reason not to do so? If not, should we use 
u'\xd7' or '×' in the actual sources (the latter requiring the file's 
encoding to be declared at the beginning of the file, like: # -*- coding: 
utf-8 -*-)? If we can use unicode, it might be nice to use real minus signs 
as well, −123 rather than -123.

Darren

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