Skip past tracing-only error chain links when choosing the "best error message".  This allows admins to see, for example, the following in their Apache error_log:
Skip past tracing-only error chain links when choosing the "best error
message".  This allows admins to see, for example, the following in
their Apache error_log:

   [Fri Oct 09 16:37:00 2009] [error] [client 127.0.0.1] Failed to load the \
   AuthzSVNAccessFile: Circular dependency between groups 'devs1' and 'devs'

instead of this considerable less-helpful error:

   [Fri Oct 09 16:25:28 2009] [error] [client 127.0.0.1] Failed to load the \
   AuthzSVNAccessFile: traced call

* subversion/libsvn_subr/error.c:
  (svn_err_best_message): Skip past tracing-only error chain links.
  (svn_handle_warning2): Don't skip past tracing-only error chain
    links here, as svn_err_best_message() (which this function calls)
    will do that for us now.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion