result_q returns command results to shell surface
result_q returns command results to shell surface

* result_q queue used for sending blocks from completed commands
* result_q in scope of chitin shell, allowing us to print a nice
    table of completed UUIDs and the command string before prompt
* `Chitin` object stores some number of previous completed command
    blocks to allow inspection of stdout/stderr without eating
    all the RAM if one is running a large array of commands
* result_q is cleared and copied into `Chitin` circular array
    before printing the contents of said circular result array
* Removed a lot of spurious garbage
* Insert sleep(1) during orchestrate poll to cut CPU load
* Remove stdout/stderr prints from post command handling
* Remove some unnecessary debug statements
*

SamStudio8/chitin