[Subversion Wiki] Update of "NonNormalizingUnicodeCompositionAwareness" by brane

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The "NonNormalizingUnicodeCompositionAwareness" page has been changed by brane:
http://wiki.apache.org/subversion/NonNormalizingUnicodeCompositionAwareness?action=diff&rev1=9&rev2=10

  The Subversion server should no longer accept 'add':ing paths that cause "normalized-name collisions". The comparison with existing paths (and other paths in the same txn) should be performed in normalized form. However, the paths created in the repository will keep the form input by the client.
  
  There could be a performance impact. [Need more data] However, the 'add' operation is not one of the most frequent ones, in a typical installation.
+ {{{#!wiki note
+ The major impact would not stem from collision avoidance on `add` but normalization during directory search, which affects most other operations. For the server, it is probably better to store names twice (original for display and normalized for indexing) rather than normalize on every lookup.}}}
  
  It is not possible to rely on client behavior. A Subversion server can be accessed via mod_dav_svn, and elder Subversion clients.