saves the diagram picture in the file whose pathname is given
in argument, the produced file is a PNG file.
The aspect of the diagram is :
- its visible part in case it is open
- the aspect specified by its prefered size and scale in case
these last are specified (see menu on a diagram view)
- else the default diagram aspect, which is probably not as you want

On error return FALSE in C++, produce a RuntimeException in Java

Declaration :

• Uml : + saveIn(in s : string) : bool, exceptions : RuntimeException
• C++ : public: bool saveIn(const QByteArray & s) const
• Java : public void saveIn(String s) throws RuntimeException

the constructor, do not call it yourself !!!!!!!!!!

Declaration :

• Uml : # UmlBaseDiagram(in id : item_id, in n : string) :
• C++ : protected: UmlBaseDiagram(void * id, const QByteArray & n) : UmlItem(id, n)
• Java : protected UmlBaseDiagram(long id, String n)