Updating the processing step to be more efficient

[mckeehan]

Jason, I re-wrote the MAIN body of this script to use a single call to jq making the script much faster (and less resource intensive).

Old:

$ time bash pota-spots
real    0m9.226s
user    0m8.097s
sys     0m1.415s

New:

$ time bash pota-spots
real    0m0.358s
user    0m0.100s
sys     0m0.058s

I also changed the method used to generate temporary files to use mktemp which should be safer....since these files are written to /tmp, it should be relatively safe to just leave them (might be handy if something goes wrong)....or you could add steps in the script to remove them at the end.

de KI4HDU