file.

	modified:   SmGrConfMatrix.py
	modified:   evallg.py
	modified:   testlg.py

(left and right of the comparison)
Modify evallg.py to add the option to compute these matrices and build
the HTML file.
	modified:   evallg.py
	modified:   lg.py

Add the comparison of substructure at primitive and object levels.
Add a test suite to test it.
	new file:   SmGrConfMatrix.py
	modified:   evallg.py
	modified:   lg.py
	new file:   smallGraph.py
	modified:   sumMetric.py
	modified:   testlg.py