Remove some leftover unused imports

See merge request !45

Fix: Correct labeling to display column partition

See merge request !44

* Contains a full replacement for the adjacency matrix test that uses
  the matrix from our paper. This makes the test easily verifyable by
  looking at the graph in the paper

* Before: Although we partition columns the output suggested that the
  row nodes were colored in bipartite graphs
* This was caused by mislabeling in DotWriter, swapping c_ and r_ label
  prefixes.
* The way the labels are currently written this commit also swaps the
  pseudo side flag used for adjacency graphs for correct output

* Old terminology was inconsistent with rest of the program and most of
  the literature on matrices
* x corresponded to i and y to j which is an uncommon mapping of the
  axes
* This does not change how the graph nodes are created from the indices

Various matrix improvements

See merge request !42

* We only use Multiply to compute the compressed matrix. With our
  current implementation this is always DoubleMatrix * IntegerMatrix.
* As the Multiply methods are all the same except for the signature we
  delete the unused ones
* This can be considered temporary until we solve the matrix generics
  problem for good

* Improves performance for all commands that output a matrix

Fix: Fix incorrect dimensions for seed matrix

See merge request !41

* Seed matrix now receives the n dimension of the input matrix as its n
  dimension

Fix: Change backing datastructure of graphs

See merge request !40

* Replaces List with Dictionary with the node index being the key and
  the GraphNode (also containing the index) the value
* This dramatically speeds up the MatrixMarket string to graph
  transformation in MatrixMarketReader since adding edges and in
  particular nodes to the graph is much faster
* This is because the nodes are added to the graph as needes i.e. the
  graph searches for them in the existing node list and if not present
  adds them. This search is significant the larger the graph gets. This
  is also why the transformation of larger graphs took exponentially
  longer.

Fix: Cache ColorsUsed for huge performance boost

See merge request !39

Properly add sample matrices used in demos

See merge request !38

* This should theoretically improve performance as we only calculate it
  once instead of once for every colored node

* This commit provides the proper fix mentioned in
  cd423d9d
* We still keep the caching implemented in
  cd423d9d

* This greatly increases performance (Many orders of magnite faster)
* ColorsUsed is implemented so that every time it is queried the value
  is calculated on the fly
* When writing ColorsUsed I did not think this would be a problem since
  we only need it once: When calculating the color
* But the actual implementation used it at two points so that for x
  colored nodes the ColorsUsed were calculated twice.
* Ideally this would be fixed by changing the ColorsUsed implementation
  in the -Graph classes. This might be fixed later so consider this
  commit a hotfix

Fix: Improve README formatting

See merge request !37

Run command is now highlighted better

These example matrices were used in multiple presentations that
accompanied this project.
It includes the bipartite graph from our coloring paper as well as
select matrices from the SuiteSparse collection.
The SuiteSparse matrices are distributed under the CC BY 4.0 license.

Add License

See merge request !36

Fix: Correct package name for some Convert classes

See merge request !35

Delete auto-generated unit test

See merge request !34

Make node counts attributes

See merge request !33

Same reason as for 5fd5ce0a

* Also fix all usages

Change all strings to Strings

See merge request !32

* Better consistency
* string is just an alias for String
* As Strings are objects it makes sense to refer to them with according
  notation

Provide instructions on how to run tests

See merge request !31

Change build to single file release

See merge request !30

Add tests for Convert package

See merge request !29