Update `prepare' functionality:
    
        - Rename `prepare_doImages.sh' to `prepare_updateImages.sh'.
    
        - Rename `prepare_doManuals.sh' to `prepare_updateManuals.sh'.
    
        - Rename `prepare_doLinks.sh' to `prepare_updateLinks.sh'.
    
        - Rename `prepare_checkPackages.sh' to `prepare_updatePackages.sh'.
    
        - Rename ACTIONNAM variable name to PREPARE_ACTIONNAM, and
          ACTIONNAMS to PREPARE_ACTIONNAMS.
    
        - Move definition of default actions performed when no option is
          provided in the command-line; from `prepare_getOptions.sh' to
          `prepare.sh'.
    
        - There is no need to reset positional paramters inside
          `prepare.sh' using ARGUMENTS variable. Inside `prepare'
          functionality, the information set by ARGUMENTS is only used
          when options are retrived from the command-line in the
          `prepare_getOptions' function.