suppressed a number of gratuitous unistd inclusions + clean up preview progress dialog code

--HG--
branch : WINDOWSPORT

Jean-Francois Dockes Jean-Francois Dockes 2015-09-24

changed src/qtgui/guiutils.cpp
changed src/qtgui/main.cpp
changed src/qtgui/preview_w.cpp
changed src/qtgui/rclmain_w.cpp
changed src/qtgui/snippets_w.cpp
changed src/qtgui/spell_w.cpp
src/qtgui/guiutils.cpp Diff Switch to side-by-side view
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src/qtgui/main.cpp Diff Switch to side-by-side view
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src/qtgui/preview_w.cpp Diff Switch to side-by-side view
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src/qtgui/rclmain_w.cpp Diff Switch to side-by-side view
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src/qtgui/snippets_w.cpp Diff Switch to side-by-side view
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src/qtgui/spell_w.cpp Diff Switch to side-by-side view
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