configuration prefix is dirname of --conf-path=PATH
fix paths in default nginx.conf

    *) Feature: the "stub" parameter in the "include" SSI command.

    *) Feature: the "block" SSI command.

    *) Feature: the unicode2nginx script was added to contrib.

    *) Bugfix: if a "root" was specified by variable only, then the root
       was relative to a server prefix.

    *) Bugfix: if the request contained "//" or "/./" and escaped symbols
       after them, then the proxied request was sent unescaped.

    *) Bugfix: the $r->headers_in("Cookie") of the ngx_http_perl_module now
       returns all "Cookie" header lines.

    *) Bugfix: a segmentation fault occurred if
       "client_body_in_file_only on" was used and nginx switched to a next
       upstream.

    *) Bugfix: on some condition while reconfiguration character codes
       inside the "charset_map" may be treated invalid; the bug had
       appeared in 0.3.50.

    *) Change: the "proxy_redirect_errors" and "fastcgi_redirect_errors"
       directives was renamed to the "proxy_intercept_errors" and
       "fastcgi_intercept_errors" directives.

    *) Feature: the ngx_http_charset_module supports the recoding from the
       single byte encodings to the UTF-8 encoding and back.

    *) Feature: the "X-Accel-Charset" response header line is supported in
       proxy and FastCGI mode.

    *) Bugfix: the "\" escape symbol in the "\"" and "\'" pairs in the SSI
       command was removed only if the command also has the "$" symbol.

    *) Bugfix: the "<!--" string might be added on some conditions in the
       SSI after inclusion.

    *) Bugfix: if the "Content-Length: 0" header line was in response, then
       in nonbuffered proxying mode the client connection was not closed.