A proposal or test implementation for linear expression`

Various changes.

Removed some unnecessary files.

(none)

Adding a function which returns the mate of a node.

following the changes of max_matching.h

Now, the actual drawing is made by run() instead of the destructor.

resetPos deleted

- Nodes are drawn in a better way
- Arrowheads made more similar in parallel vs. non-parallel modes.

One more node-shape added.

Correct bad arrow enpoint when parallel edges are enabled.

In graphToEps(), nodes may have different shapes (circles or squares).

- Parallel edges look a bit better
- Possibility to insert verbatim PS blocks for each node

Functions added to compute the gradient of Bezier curve.

Doc improvements

findEdge bugfix.

more precise distinction 'tween low and high level lp interfaces

Changes in doc.

Serious buxfig in findEdge()

Edmonds max_matching.h tester

Edmonds matching alg

functor->map and map->functor converters added.

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