update convenience functions
update threshold values dynamically
otherwise problems occur with saving wrong values when switching between C/F
more accurate progress bar display
we only use Fahrenheit for display, don't change the values!
show ºF on updates via javascript
initial display of temperature in ºF
still need to update javascript
account for thresholds and bar width in ºF
global variables are really really ugly, this should be wrapped in an anonymous function
display/enter thresholds in ºF as well
fix copy/paste error
provide temperature in Fahrenheit
Also resolve some indent issues, restrict live updates to temperature value only (not unit text)
checkbox for option to display Fahrenheit
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