Use bash's `type`-style formatting for whitespace
Use four-space indents in install.sh

Bash's `type` output uses four-space indents, so follow its lead.
Keep compound Bash statements on one line

Bash's `type` output has if/then, while/do, etc statements on one line.
Follow its lead, except where that would lead to over-long lines.
Merge branch 'shell-standards'