Make CLICBOARD location configurable as an environment variable.
Usage function.  Not quite yet accurate; "Readme driven development"
sort of.
Rename copy function for clarity.  Bugfix to be able to copy large data without base64 wrapping lines.
Implement working (!) paste function using tac, sed, cut, base64
Determine the function a bit more accurately.
Yes, I'm about to unit test a shell script.