Fix TD3511 and ISKRAemeco MT174 issues
Code reformatted
Harmonized aggmode naming between conf and code
Merge pull request #52 from andig/td3511-v2

Fix TD3511 and ISKRAemeco MT174 issues
Merge pull request #53 from andig/aggmode

Harmonized aggmode naming between conf and code
Fix obis parsing failing on hex digits (thanks to Udo)
Merge pull request #55 from andig/fix-obis

Fix obis parsing failing on hex digits