Break Cycles Seg Fault

Description

When using the "parse again" button on invalid Graphs sometimes a Segfault occures. Invalid Graphs are especially often generated by the "break cycle" routine.

Reproduction of this bug:

1. xcdg deutsch
2. inputwordgraph "Ich bin ein Brot"
3. newnet
4. frobbing
5. In the Tree Editor link the "Brot"-Node to the "ein"-Node (edit the APP-edge) to form a cycle
6. click Edit->Break Cyles.
7. click the right-arrow-icon (or alternatively use Edit->Parse again) multiple times
8. Segfault

Kilian says:

OK, transform.c 1.46 corrects an initialization order error that segfaults if a ProblemStruct is deleted very early. That fixes the crash for me; does it work for you?

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