Improvement: smooth installation on non-root systems

[edmcman]

I am installing dorothy on a machine that I don't have root on. It begins to install the required packages, and basically prompts me to enter a sudo password many times for bash, moreutils, llvm, openssl, and so on. This is pretty annoying. I can press Ctrl-D to make sudo bail and dorothy continues, but it's definitely not a great experience.

Since dorothy can't upgrade the bash package, it also downloads and installs a new version of bash from source, which I really didn't want it to do.