Add R key words

[lloyddewit]

See IDEMSInternational/R-Instat#8565 for a partial test .

[lloyddewit]

See IDEMSInternational/R-Instat#8533 for script, posted on18/10/23, that contains with and within functions that have a block of code enclosed in curly brackets.

Suggested test:

        'TODO
        strInput = "Nightingale <- within(Nightingale, {" & vbLf &
                   "Total <- Disease + Wounds + Other" & vbLf &
                   "Disease.pct <- 100*Disease/Total" & vbLf &
                   "Wounds.pct <- 100*Wounds/Total" & vbLf &
                   "Other.pct <- 100*Other/Total" & vbLf &
                   "})" & vbLf
        strActual = New RScript.clsRScript(strInput).GetAsExecutableScript()
        Assert.Equal(strInput, strActual)