Defines the type of a DataField.

Remarks:
The type of a DataField influences its allowed use in expressions within a FormLayout. The DataFieldType also influences the conversion method when reading a DataField from a DataSource. Currently three different data-types are supported - it is recommended to use the type Text whenever possible.
Enumerator:
eVarType_Text  A text (string or character). This is the recommended EVarType.
eVarType_Long  An integer number. When reading a DataField of this type from a DataSource it is converted automatically to an integer. In case of conversion errors the result is 0 (no error or exceptions will be raised).
eVarType_Float  A floating point number. When reading a DataField of this type from a DataSource it is converted automatically to a double. In case of conversion errors the result is 0.0 (no error or exceptions will be raised).
eVarType_Invalid  Invalid data-type (DO NOT USE).


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