Add the multi labels metric for the nodes and edges level
(not for segments)
	new file:   Tests/multiLab0
	new file:   Tests/multiLab0a
	new file:   Tests/multiLab1
	new file:   Tests/multiLab1a
	new file:   Tests/multiLab2
	new file:   Tests/multiLab2a
	modified:   lg.py
	modified:   testlg.py

	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

	modified:   SmGrConfMatrix.py
	new file:   Tests/segment5erra
	new file:   Tests/segment5errb
	new file:   Tests/segment6erra
	new file:   Tests/segment6errb
	modified:   testlg.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

	modified:   sumMetric.py

	new file:   Tests/segment1sc
	new file:   Tests/segment2sc
	new file:   Tests/segment3sc
	modified:   lg.py
	modified:   testlg.py

led to negative error measures.

Modified lg2txt.py to support mapping arbitrary symbols with certain relationships; updated mathMLMap.csv mapping file.

Added lost changes from previous commits; created default mappings for symbols and relationships, updated translation file.

Updated evaluate (keep rather than delete files; don't generate .dot/.pdf by default); symbol counts added to sumDiff.py