Update `help' functionality:
    
        Help/help.sh:
    
            - Move execution of reading action (texinfo_searchNode) to
              actions that might need or not action values to do their
              work.
    
        Help/Backends/Texinfo/texinfo_searchNode.sh:
    
            - Now that reading action is under actions that might need or
              not action values, start using function positional
              parameters to retrive action values and convert them to
              documentation entries, which are used to build the node
              string that we pass to info reader.
    
            - More thatn one action value can be passed to this function.
              There is loop here through manual entries to support reading
              of more than one action value.
    
            - When the action value doesn't exist, keep asking the user to
              create it.
    
            - There is no need of adding Directory to node definition.
              This construction is alredy done by `texinfo_getNode'
              function.
    
        Help/Backends/Texinfo/texinfo_getNode.sh:
    
            - Stop using ACTIONVAL variable as source for NODE building.
              The MANUAL_ENTRY variable is used instead. 
              
            - In order for this function to work, it must be invoked in a
              context where the MANUAL_ENTRY variable be already defined.