No import created for constructor calls in certain cases

[Matthias Schoettle]

In the following example, no import is created for MinuetoFrame.

The new instance is assigned to an existing association end with a type of a super class of MinuetoFrame.

[Matthias Schoettle]

Resolves #254: Adds all classes of which operations are called.

When the given class is the sender of a message, the message signature's class (container of the operation) is included in the set of considered classes for imports.

→ <<cset e7022ba2a2bb>>