Multiple bug fixes from Sebastien:

    - Fl_GIF_Image and Fl_PNG_Image didn't close the file before
      calling Fl::error().
    - Fl_Help_View didn't clear the line array in Fl_Help_Block,
      and Fl_Help_Block::font and ::size were not used.
    - Fl_Shared_Image::get() didn't return NULL if the image
      could not be loaded.
    - Switched to more efficient code for
      Fl_Tiled_Image::color_average() and ::desaturate().
    - Don't delete children in Fl_Text_Display since the group
      will do it.
    - Fixes to filename_isdir(), filename_absolute(), and
      filename_relative().
    - Was using numbers instead of define constants for some
      OpenGL stuff under WIN32.
    - Wasn't exporting threading functions under WIN32.
    - The Fl_Widget destructor now removes from the parent to
      avoid a Purify error since the old widget would be
      referenced by the parent when it was destroyed; this has
      no apparent performance impact since Fl_Group::clear()
      sets children_ to 0, making Fl_Group::remove() very
      fast...
    - WIN32 font enumeration datatype fixes...


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@1878 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

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