Useless code cleaning
State URL button rework
The state URL now uses the referer, so jrds does'nt have to know how it's accessed.
JSonPack failed, manage the case were the referer is missing.
Failed collect in the method Probe.getNewSampleValues must return null, not an empty map.
bad management of failure case in the ExternalCmdProbe
Added a JMX connection test
Don't reuse the same port for the jmxconnexion test
Try to synchronized jmx connections test
Finally working jmxconnection test
Added a singloton Configuration, it's not managed from within the webapp any more, preparation for a JMX-only jrds.
Lots of rewrite and cleaning of webapp junit tests.
Added jmx auto-configuration, no more endless -D… on command line.
Merge branch 'master' into WithStore

Conflicts:
	src/jrds/Probe.java
	src/jrds/PropertiesManager.java
	src/jrds/probe/ExternalCmdProbe.java
	src/jrds/probe/RRDToolProbe.java
	src/jrds/webapp/StartListener.java
Removed StoreOpener, now part of the RrdDbStore
Configuration of the store in HostsList, not PropertiesManager
An extractor fills a rrd4j's Graph or DataProcessor.
Forgotten case to choose the source name, it can be the data source.