Fix dot print

[SiccoVerwer]

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Unit Test Results

1 files  1 suites   0s ⏱️
4 tests 4 ✔️ 0 💤 0 ❌
7 runs  7 ✔️ 0 💤 0 ❌

Results for commit 2fecb90.

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[hwalinga]

I think the node numbering bookkeeping should also be done by the mem_store as suggested in #23. Then it will automatically be fixed for the split routines.

Now node numbering relies on inputdata::add_trace_to_apta that keeps a increasing int node_number in its class members. However, split routines just call mem_store::create_node (just like done in inputdata::add_trace_to_apta). If the mem_store maintains the node_number instead it will automatically add the correct unique increasing integer identifier when the mem_store::create_node routine is called. This will apply correct numbering during splitting and apta creation and fix the problem for good.

#23 Also suggests doing this for the unique increasing integer identifiers for traces and tails.