Add more robust error checking

[rjsears]

Need to add more robust error checking on both the plotter and NAS side to monitor for broken plot transfers and alert us to the fact something is wrong. This could look at multiple things such as a failure of the plot check.

We could create a function that internally monitors the plot moves and triggers an error/warning/notification if it failes.

Every once in a while we have a plot move get stuck and we need to know why and be able to recover before it stops our plotting.