Alternative set of rules for text indent calculation (start-indent and end-indent...

Alternative set of rules for text indent calculation (start-indent and end-indent) which tries to mimic many commercial FO implementation that have chosen to break the specification in this aspect. I think I have found the behaviour for most cases. But I'm operating in reverse-engineering mode here and not all FO implementations behave in the same way!
This is an optional feature that has to be explicitely enabled through the user agent. Otherwise, FOP will behave like before.
In the FO tree tests a processing instruction is used to enable the feature/bug ;-) in the user agent so I can test both cases.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@354763 13f79535-47bb-0310-9956-ffa450edef68