feature(report): enable colouring for the dot (folder level) reporter (…

…sverweij#240)

also:
* consolidates the dot and ddot reporters
* removes self-transitions from the dot output
* uses default round-edge rectangles instead of the folder shape for nodes
* makes the `.` nodes look like they're part of the cluster (which looks more natural)

Makefile

@@ -3,8 +3,7 @@ NODE=node
 RM=rm -f
 GENERATED_SOURCES=src/cli/initConfig/config.js.template.js \
 	src/report/csv/csv.template.js \
-	src/report/dot/moduleLevel/dot.template.js \
-	src/report/dot/folderLevel/ddot.template.js \
+	src/report/dot/dot.template.js \
 	src/report/html/html.template.js \
 	src/report/err-html/err-html.template.js \
 	src/schema/configuration.schema.json \