* sysinfo.json additions
lua library additions
Dependent on #389 and #391
Replaces #387
* additional check for nil needed
tested on a node with several very marginal RF links (IP, no host name) and it is working, so far.
also removed the decimal point on the n/lq values, we didn't need 10 places of accuracy. :)
* a couple more small changes
* changed neighborLinkInfo() function in aredn.info to show *all* links, not just RF.
Adds additional info for each RF link (tx/rx_rate, noise, signal)
* Removed redundant function.
Removed functions no longer needed.
Reworked getCurrentNeighbor function to add in the additional RF link info if requested.
* Added Uptime and Load Averages to the sysinfo.json file.
All code copied from Darryl, dman776.
* Updated Api Version number to 1.2.
Updated Api Version Number to 1.2.