Local variables defined multiple times

[Matthias Schoettle]

In certain cases local variables are defined several times by the code generator.

For example, the following model exposes this problem:

This is due to the changes in commit e35de23c9736 as preparation for #430.

[Matthias Schoettle]

Resolves #478: Fixes the way the first use of a temporary property is determined.

Only the containers of the fragment and its ancestors are considered instead of all fragment containers inside the message view.

The absolute index is properly calculated by using a list of all fragments. For easier implementation a Java service is used.

→ <<cset c691ecea712e>>