#74 Provide equivalent to GLOBALV

[Shmuel (Seymour J.) Metz]

CMS has a command called GLOBALV that allows passing variables between REXX scripts, even across logons. It uses the files

    SESSION GLOBALV (for values required throughout the session)
    LASTING GLOBALV (for values that are to last permanently).
    (INITIAL GLOBALV) (for default values)

I'm only concerned with two of the GLOBALV functions, e.g.,

            GLOBALV SELECT PFXHLASM SETP INDENT_DO 3
           GLOBALV SELECT PFXHLASM GET  INDENT_DO INDENT_IF

but if it's easy to impliment more I believe that people would exploit that.