changed RUN_AGENTS to point in the new location of run-agents;
renamed duplicate node ID
fifth attempt to check in agents directory
example of variables not changing in the viewer -- not yet refactored into the test directory
first version of run-agents
added .pli plans; added note wrt simulator.ple not being able to
plexilisp versions of the three example files which are intended to mimic all their behavior
test case for problem with assigments not showing up in the viewer