work around sr.ht
don't make readers think of Prolog the language
quote more variables
Thanks mulle-nat; fixes https://notabug.org/akkartik/basic-build/issues/2.
subtle weaseling in marketing copy
The new language is necessary because we wouldn't actually work with the
original Bourne shell. Thanks jwilk! (https://news.ycombinator.com/item?id=15044709)
Switch the default language to C99.
In 2016 it finally became the default language in the default compiler
shipping with the current Ubuntu LTS (16.04).
(We're still not running that distro, but 18 years seems like a long
enough wait for people to upgrade their compilers.)