Also mention LaScala, Stillman paper in doc on Schreyer orders
Fix laplacianMatrix, degreeMatrix, and install a test for them
Rearrange unit test files for testing ring arithmetic.

File rings-test.cpp has been split up into one per ring.
Merge pull request #2 from tom111/Integration

One doc fix and one fix for the Graphs package
Merge git and svn histories

git-svn-id: svn://svn.macaulay2.com/Macaulay2/trunk@15794 a8012f80-5f13-0410-8dc0-eb77bd940c0d
Fixed a bug in Hom(--,N) which caused examples to fail.

The code for dual of a matrix uses this code, and it was returning a
matrix which was not evidently a map of free modules, which caused
other tests to fail.  The test 'Macaulay2Doc/test/dual.m2' tests the
behavior of this function, including checking that functoriality
and use of 'homomorphism' still work.
temporary fix: in Posets, changed two uses of vertices to Graphs$vertices