Updated pgflagger.py so that we don't have to copy mirexecb.py to the
working directory.
Added watch_process.py, which uses psutil to collect and plot some very
simple statistics about a running process. Note that a command.txt sort of
file, has to be used and specified for the script to run. Each line should
contain the command line incantation of the script, e.g:
bash hello_world.sh
python hello_world.py -c whatever -b more,stuff