Make it possible to remove breadcrumbs in child projects again
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                 Key: MSITE-582
                 URL: http://jira.codehaus.org/browse/MSITE-582
             Project: Maven 2.x and 3.x Site Plugin
          Issue Type: New Feature
          Components: inheritance
    Affects Versions: 3.0-beta-4
            Reporter: Andreas Sewe
         Attachments: example.tar.gz

Currently a child can only add more breadcrumbs. There are situations, however, 
where it is desirable to remove some or all of the breadcrumbs defined by the 
parent, in particular when the Maven project hierarchy doesn't match the 
_natural_ hierarchy of the site. See 
<http://www.mail-archive.com/users@maven.apache.org/msg117974.html> for an 
example (also attached).

One way to do this, without requiring changes to the {{site.xml}} format and 
with only minimal breakage of compatibility, would be to simply use the child's 
breadcrumbs wholesale whenever they are a prefix to the parents.

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