This is a first step toward fully-automated formatting. A custom format
is used, primarily to tell rustfmt to wrap at column 80(-ish) instead of
column 100(-ish), and to use more compact styles.
Many rustfmt suggestions for rewrapping function calls were ignored
because they did not result in the minimum number of lines and/or
because I'm still unsure the best way to format a long chain. Some
suggestions for reformatting macros were ignored because they ruined
the indention. Some other suggestions were ignored because they seemed
like bugs and/or seemed to make things clearly worse.
Further work is planned, in order to make the formatting fully
automatic.
