C++ Container equivalents

[Henning Hasemann]

As said before the situation is bad, but allows for re-inventing the
wheel with a good excuse (the dream of all coders ;-)).

I have written:
- a double linked list
- a dobule linked list that stays sorted
- a set (based on hashmap over bool)
- a heap
- an implementation of the dijkstra algorithm
- Iterator classes/Interfaces

naturally all fitting together. Since I coded just what I needed for
my current project, you would maybe miss some functionality but if you
can use any of it, Im happy to share.

Henning

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