+/* Creates and returns a new pivot_value whose contents is the LENGTH bytes of
+ TEXT. Use SIZE_MAX if TEXT is null-teriminated and its length is not known
+ in advance.
+
+ This function is for text strings provided by the user (with the exception
+ that pivot_value_new_variable() should be used for variable names). For
+ strings that are part of the PSPP user interface, such as names of
+ procedures, statistics, annotations, error messages, etc., use
+ pivot_value_new_text().j
+
+ The caller retains ownership of TEXT.*/