[CM] rt examples

[Rick Taube]

ive started a real time examples file in cvs (cm/etc/examples/rt.cm, 
rev 1.2). the fm harmony example towards the end of the file is fun. as 
a test i did the current set of examples as forward chaining networks 
based on that toy box program. i injected the boxes with a dose of 
steroids (feedback, setting args in  forward fns, stopping propagation, 
etc) and moved them to the end of objects.scm until i can figure out 
what if anything i should do with them.  see objects.scm for 
documentation if you are interested. the first few example in rt.cm 
demo it midi and should work in any cm.