commit: fp_Line.cpp,h; fb_LineBreaker.cpp

[Tomas Frydrych]

I have extracted the Tab-width calculation code from fp_Line::layout 
into _calculateWidthOfRun and created a wrapper for this function 
called calculateWidthOfRun for use from fb_LineBreaker. This 
makes it possible to remove the duplicate Tab-width calculation 
code from fb_LineBreaker (which was a maintanence nightmare).

Tomas