Use signed values for timing to help with rollovers.

makes the maths work properly.
Fix plugged in detection.

Was using the wrong pullups.  (Also, fix all compiler warnings)
[boxcar] add simple ADC readings
boxcar - speed up spi to mrf module.

No need to run so slowly now that we're on a real pcb
Remove some garbge prints
Update sensor id definitions
[boxcar] start sending to the karlnet
Replace stomp with mqtt.

Servers are far easier to manage, client tools are easier to use.
Update general pachube poster to use mqtt instead of stomp
Update library of alexandria to use mqtt instead of stomp

So much easier to modify when the underlying code was cleanly written
No need for whole scripts to watch messages.

We're using mqtt, it's all easier.
Switch stomp to mqtt
Use new style api urls for cosm (nee pachube)
Update docs...
Support variable mqtt host for the consumer
common - need to use packed to match old avrs

otherwise they were getting padded out on stm32
Support multiple bit depths for temp probes
Only send sensors that are connected
boxcar - make the destination station configurable
Bump simrf library