Merge pull request #26 from cmpterman2/master

Fix for overshoot when duty hits -100 and output would turn off until restart
Update README.md
Update README.md
Fix inverted outputs values
Improve changing the units whilst running
Merge branch 'master' of github.com:DougEdey/SB_Elsinore_Server
Improve the drag and drop
Allow hyphens in the device names
Add graphs to the main display
Merge pull request #27 from DougEdey/master

Merge from master