Properties contain assignement operators for union members

```
1>h:\projects\mili\tests\properties_tests.cpp(53): error C2622: member 
'TemperatureSensor::celcius' of union 'TemperatureSensor::<unnamed-tag>' has 
assignment operator

http://msdn.microsoft.com/en-us/library/txfhkhkt.aspx
http://gcc.gnu.org/ml/gcc-help/2008-03/msg00051.html
```

Original issue reported on code.google.com by `esteban....@gmail.com` on 7 Jan 2012 at 10:40
