Add support for the "Exist" function in the Mathscript RT Module for the LabVIEW RTE

[WillMck]

http://zone.ni.com/reference/en-XX/help/373123C-01/lvtextmath/_rte_suplvtextmath/

[Deborah_B]

Hi BIGMACK,

Do you need "Exist" to indicate variable, MathScript function, and/or script support?

Thanks!