Patch 31206 by Luca Furini:

Patch 31206 by Luca Furini:

- A new interface InlineLevelLayoutManager, implemented by LeafNodeLM,
  InlineLM, TextLM, BasicLinkLM and ContentLM

- Leaders with pattern "use-content" and "dots" now works

- Better handling of preserved linefeeds

- Correct calculation of the lineheight, according to the value of the
  property vertical-align

For a few points which may need further work, see the bugzilla page.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@198142 13f79535-47bb-0310-9956-ffa450edef68