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cYS#t$rYYywxYwt$rt�wxYw)a�Get the value which is assigned to an option.

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          * string (if only one value is available)
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          * list (if more than one option is found)
            - having multiple references of the same type is allowed.
              for example it is not unusual to have 2 references to
              Screen sections in the ServerLayout section (in case of
              Xinerama)
            - if the options are actually options and not references
              then there are duplicate options, which should be detected
              in advance with get_duplicate_options()   
          * None (if no value can be found) - Not always true -> See below.

        Use-case for returning None
          * When dealing with incomplete references. For example:
                Screen "Configured Screen"
              is different from:
                Screen
                (which is an incomplete reference)
          * When dealing with incomplete options. For example:
                Depth 24
              is different from:
                Depth
                (which is an incomplete option)
          * Exception:
              Some options (with the "Option" prefix) (not references)
              can be used with no value (explicitly) assigned and are
              considered as True by the Xserver. In such case get_value()
              will return "True". For example:
                Option "AddARGBGLXVisuals" 
              is the same as:
                Option "AddARGBGLXVisuals" "True"

        Meaning of keys in Sections and SubSections:
          * When dealing with a Section:
              section= e.g. 'Screen', 'Device', etc.
              option= the option
              position= e.g. 0 (i.e. the first element in the list of Screen
                        sections)
              reference= used only by get_references()

          * When dealing with a SubSection:
              section= 'SubSection' (this is mandatory)
              option= the option
              position= e.g. 0 would mean that the subsection belongs to 
                        the 1st item of the list of, say, "Screen" sections.
                        (i.e. the first element in the list of Screen 
                        sections)
                        ["position" is a key of an item of the list of 
                        subsections see below]
              identifier= the name of the subsection e.g. 'Display'
              sect = the 'section' key of an item of the list of 
                     subsections e.g. the "Display" subsection can be 
                     found in the "Screen" section ('sect' is the latter)

        Anatomy of Sections and SubSections:
          * Anatomy of subsections:
              self.globaldict['SubSection'] =
                  {0: {'section': 'Screen', 'identifier': 'Display', 
                   'position': 0, 'options': [option1, option2, etc.], 
                   etc.}
                  In this case we refer to the 'Display' subsection 
                  which is located in the first 'Screen' section.

          * Anatomy of a section:
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