Plot function overrides data in mulit-test simulations

[mferris03]

due to the plot function using write and generating a new plot each time, tests such as run_rx_tx only provide the graph for the last test. In the future, some sort of check as to whether or not the test is the last test could allow for caveat_env to keep data persistent across runs.
Currently, it seems that line the init of caveatMonitor overrides previous coroutines, and instantiating a monitor on monitor list overrides the previous monitor object .

[unbtorsten]

Can't reproduce this. This is what the output looks like for me:

[mferris03]

that is the expected plot for run_rx_tx in its current state, however given run_rx_tx calls two tests it overrides all data from the first, except sim time(and the tx rate). Maybe this should be tracked as a feature to add rather than a bug, however in my mind if one test calls multiple, the persisting caveatenv should output plot data from all tests rather than the last

[unbtorsten]

I see. Yes, the combined report should contain all plots (or a combined plot?!)