v2.1.3

Compare: v2.1.2...2.1.3

• fix emonhubtx3einterfacer to accept floats & improved numeric check
• installation script changes, part of work on EmonScripts
• datacode documentation clarification
• correction of 3 phase node configurations
• data whitening option in jeelib interfacer
• updated graphite interfacer
• emonTx3CM node configuration
• Tesla PowerWall interfacer