[dokuwiki] small patch for hierarchical "you are here"

Hi,

I wanted to use a custom URL for the base page in the hierarchical
"you are here" breadcrumb trail, so I hacked in a 3-line change that
seems to do the job.  It works by checking if conf['custom_base_url']
is defined -- if so, it uses that instead of the regular link.

For example, if the hierarchical breadcrumb trail looks like this:

  start >> foo >> bar

...then this will allow you to change the URL that "start" points to.

FYI, I wanted this behavior because the "main" page of my wiki needs
to be an external file.  I don't know if this is the best way to get
this behavior, but I thought it couldn't hurt to provide a patch.

   nate-

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