commit HEAD: more hidden text stuff

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Improved logic for moving insertion point across hidden text,
allowing for hidding entire blocks, both via the display:none
property, and using the collapse()/isCollapsed() mechanism.

added several new functions to fl_ContainerLayout:

  bool canContainPoint()
  virtual bool _canContainPoint()
  setVisibility(...)
  isHidden(...)

In addition I have replaced most of the separate calls in FV_View of
the type

        pBlock = _findBlockAtPos();
        pRun = pBlock->findPointCoords();

with _findPositionCoords(). The reason for this is that the latter
handles hidden blocks. I have also added const qualifiers to several
functions in the FV_View class.

files: fl_ContainerLayout.h/cpp, fl_BlockLayout.cpp, fp_Run.h,
fv_View*.cpp, ap_EditMethods.cpp

Tomas

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