Canonicalize / stringprep UTF-8 filenames to handle composed / decomposed differences

http://subversion.tigris.org/issues/show_bug.cgi?id=2464




User guillaume changed the following:

                What    ld value 
               |New value
============================================================
====================
                     
CC|'benjaminm,dlux,duet,fwenz|'benjaminm,dlux,duet,fwenz
                       
|el,micvog,twalther,wincent|el,guillaume,micvog,twalth
                        |'                        
|er,wincent'
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