[PATCH] Fix copyright years in header files

[[[
* subversion/include/private/svn_atomic.h:
* subversion/include/private/svn_dep_compat.h:
* subversion/include/private/svn_wc_private.h:
* subversion/include/svn_auth.h:
* subversion/include/svn_cmdline.h:
* subversion/include/svn_ctype.h:
* subversion/include/svn_error_codes.h:
* subversion/include/svn_error.h:
* subversion/include/svn_hash.h:
* subversion/include/svn_md5.h:
* subversion/include/svn_opt.h:
* subversion/include/svn_path.h:
* subversion/include/svn_props.h:
* subversion/include/svn_ra_svn.h:
* subversion/include/svn_sorts.h:
* subversion/include/svn_string.h:
* subversion/include/svn_subst.h:
* subversion/include/svn_user.h:
* subversion/include/svn_utf.h:
* subversion/include/svn_version.h:
* subversion/include/svn_wc.h:
* subversion/svn_private_config.hw:
  Fix copyright years in header files.
]]]

If a file was modified in 2004, 2005, 2006 and 2008, should the copyright years
be written as "2004-2006, 2008" or "2004-2008"?

-- 
Arfrever Frehtes Taifersar Arahesis