Fixed problems with the page-title

Fixed problems with the page-title

The <title>-tag of the page is taken from the velocity-variable tile, if
the variable shortTitle is set. For XHTML-templates, this is the case, if
the <title>-tag on the input-xhtml is set. If the variable is not set, the
page-title is constructed from the project-name and the name of the page,
that was found in the menu-data.

A leading head in the content is not generated automatically, because the
pages, that are generated automatically by maven differ to much. Hence, the
leading head in the content must be specified by hand in the content.