Fix a bug in the TarjanSCCVisitor regarding the stack ordering #35
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* Instead of sorting the nodes when their exploration is finished, push them correctly onto the stack when starting their exploration. * Fix a wrong accessor to the node's id.
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While working with the automata lib, I came across another bug related to #21.
There are cases, where the sccId is not uniform for a single SCC at the end. Instead, the stack ordering is the most important thing. It is possible that a single SCC is constructed using more than one sccID on the stack. Luckily, it is possible to recreate the stack order in the visitor by sorting the records on the stack by the number attribute.
A new test case affected by this problem is added as part of this PR.