mostly memory consumption optimization of built-in stuff: moved serialization code to extra module so they only get loaded when necessary, drastically reduced memory consumption of component proxies, moved advanced shell stuff (redirects, pipes, variable expansion) to an extra program (besh.lua) to reduce memory footprint of shell module; shell uses $PS1 for the prompt now
Merge branch 'master' of https://github.com/MightyPirates/OpenComputers
fixed os.setenv