feat: Add png outputs in evaluate and lg2dot

bin/evaluate

@@ -94,6 +94,7 @@ then
 		mkdir $ResultsDir/errorGraphs
 		mkdir $ResultsDir/errorGraphs/dot
 		mkdir $ResultsDir/errorGraphs/pdf
+		mkdir $ResultsDir/errorGraphs/png
 	fi
 fi
 
@@ -149,6 +150,7 @@ do
 				fi
 				mv $FNAME.dot $ResultsDir/errorGraphs/dot
 				mv $FNAME.pdf $ResultsDir/errorGraphs/pdf
+				mv $FNAME.png $ResultsDir/errorGraphs/png
 			fi
 			
 			CORRECT="Incorrect"

bin/lg2dot

@@ -39,4 +39,5 @@ BNAME=`basename $1 .lg`
 # Generate dot file, then call dot and generate a .pdf file.
 python $LgEvalDir/src/lg2dot.py $@ > $BNAME.dot
 dot -Tpdf $BNAME.dot -o $BNAME.pdf 
+dot -Tpng $BNAME.dot -o $BNAME.png