URL Rewriter: higher sequencenumber for /content/urlrewriter

URL rewriter adds node 'urlrewriter' to /content by initializeitem "urlrewriter-root-content" with sequence number 29980 (version 1.03.00)

If /content doesn't exist yet, it will be created automatically with type nt:unstructured, which is unwanted.

The chance of that happening exists, since there is a guideline to have implementation projects numbers > 30000 (see http://www.onehippo.org/7_8/library/concepts/content-repository/content-bootstrap.html)

So it's better to set it higher, say > 50000