Repository's weekly update.
    
     - Scripts/Bash/Functions/Commons/cli_unsetFunctions.sh: Update
       comments.
    
     - Scripts/Bash/Functions/Commons/cli_printCopyrightInfo.sh: Update
       comments.
    
     - Scripts/Bash/Functions/Commons/cli_printActionPreamble.sh: Deleted.
       This function is no longer used. Because different functions may
       have different preamble messages, this is something we don't want
       centralize as common to all functionalities. Instead, give freedom
       to each functionality developers to create their own preamble
       messages.
    
     - Scripts/Bash/Functions/Commons/cli_getConfigValue.sh: Update comment.
    
     - Scripts/Bash/Functions/Commons/cli_getPathComponent.sh: Update
       comment.
    
     - Documentation/Models/Docbook/Tcar-ug/Scripts/Bash/intro.docbook:
       Update content.
    
     - Documentation/Models/Docbook/Tcar-ug/Scripts/Bash/mission.docbook:
       Update content.
    
     - Documentation/Models/Docbook/Tcar-ug/Scripts/Bash/environment.docbook:
       Update content.
    
     - Documentation/Models/Docbook/Tcar-ug/Scripts/Bash/cliref.docbook:
       Update content.