- initial implementation of SML plugin
# useful to read data from optical interface from eHZ
- update list entry search to check also for ending OBIS code character 0xFF
- add support for 3-byte value (un)signed integers
- add SML documentation
- add link to OBIS
Merge pull request #63 from ohinckel/dev-sml-plugin

New Plugin SML: Read data from a smart power meter device