Fixed (type,name) ordering for tkvarentry.

I was having issues with the type and the variable name getting mangled in the UI as well as when the xml was read back in by the builder.  

In the _get_value() method the ordering of the pair was parsed as (name, type) whereas in the _set_value() method as well as the builder it is (type, name).  I  changed it in the _get_value() method to minimize the number of files touched.