Function:    EnvStr()

               In Contrast to Clipper's GetEnv(), This functions does not
               search for an Env. variable, it uses an index instead to
               return the Nth environment string, including the leading
               variable name. Using this function it is possible to inspect
               the whole environment without knowing the variable names.

  Syntax:      EnvStr(i)

  Arguments:   I is the environment string number one wants.
               I must be in the range 1..EnvCount()

  Returns:     The complete Environment string, eg.
               'PROMPT=$p$g'.

  Usage:       For i = 1 to EnvCount()
                    ? EnvStr(i)
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