Update `texinfo' documentation backend inside `help' functionality:
    
        - Add `texinfo_deleteEntrySection.sh',
          `texinfo_deleteEntryChapter.sh', and
          `texinfo_deleteEntryManual.sh' to separate deletion of
          documentation entries based on value passed as non-option
          argument to `centos-art.sh' script.
    
        - Update `texinfo_deleteEntry' to start using
          `texinfo_deleteEntrySection', `texinfo_deleteEntryChapter', and
          `texinfo_deleteEntryManual'.
    
        - Fix node construction inside `texinfo_getNode' function. Don't
          remove the chapter name from node.
    
        - Update `texinfo_updateStructureSection' to be reused in both
          cases when nodes are added and removed.
    
        - Remove chapter name from menu entries build from node. The node
          value already holds the chapter name. Don't duplicate it here.
    
        - Update replacement pattern in `texinfo_restoreCrossReferences'
          and in `texinfo_deleteCrossReferences'. There is no need to use
          word boundaries matching here.
    
        - Rename `texinfo_updateChapterNode' to
          `texinfo_updateChapterNodes'.