Update SALOME User's guide:

- Move module preferences help pages from GUI User's guide to the module User's guide.

diff --git a/doc/salome/gui/VISU/images/featureedgesprops.png b/doc/salome/gui/VISU/images/featureedgesprops.png
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diff --git a/doc/salome/gui/VISU/images/ppref0.png b/doc/salome/gui/VISU/images/ppref0.png
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diff --git a/doc/salome/gui/VISU/images/ppref1.png b/doc/salome/gui/VISU/images/ppref1.png
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diff --git a/doc/salome/gui/VISU/images/ppref2.png b/doc/salome/gui/VISU/images/ppref2.png
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diff --git a/doc/salome/gui/VISU/images/ppref3.png b/doc/salome/gui/VISU/images/ppref3.png
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diff --git a/doc/salome/gui/VISU/images/pref31.png b/doc/salome/gui/VISU/images/pref31.png
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diff --git a/doc/salome/gui/VISU/images/pref32.png b/doc/salome/gui/VISU/images/pref32.png
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diff --git a/doc/salome/gui/VISU/images/pref33.png b/doc/salome/gui/VISU/images/pref33.png
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diff --git a/doc/salome/gui/VISU/images/pref34.png b/doc/salome/gui/VISU/images/pref34.png
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diff --git a/doc/salome/gui/VISU/images/pref35.png b/doc/salome/gui/VISU/images/pref35.png
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diff --git a/doc/salome/gui/VISU/images/pref37.png b/doc/salome/gui/VISU/images/pref37.png
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