new functions for changing lower and upper bounds of variables

- Fix missing file (max_matching.h)

- '%%Title:', '%%Copyright:' and '%%CreationDate:' fields added to graphToEps-
generated output
- Some more checks in configure.ac

- Node shapes are shown in the doc.
- The generated PS file is closer to be DSC conform.

Concept modification to resolve the item by its ID.

One more trial/approach for named params (Under constr.)

small changes, a try for max flow using expression

Add a 'scaleToA4()' function.

Functions to query height/width of a BoundingBox.

Wrap a long line

- Some things to do.

-=, - operators in expressions

(none)

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