Improvement: easy check for continuity

[Bibi56]

curl -s "http://ra.osmsurround.org/analyzeRelation?relationId=1083417&_noCache=on" | grep "Graph " | wc -l
tells me if the Oise river is correct (result=1) or (as now) split into chunks (result>1).
Great to be able to do that ;-).

Having a JSON output would make life easier.
http://ra.osmsurround.org/analyzeRelation?relationId=1083417&_noCache=on&output=json
(or filtering :
http://ra.osmsurround.org/analyzeRelation?relationId=1083417&_noCache=on&output=text&filter=graph_count) => 2