13.1.4 General Text Layout Control
These switches allow control over line length and indentation.
- Maximum line length, nnn from 32 ..256, the default value is 79
- Indentation level, nnn from 1 .. 9, the default value is 3
- Indentation level for continuation lines (relative to the line being
continued), nnn from 1 .. 9.
value is one less then the (normal) indentation level, unless the
indentation is set to 1 (in which case the default value for continuation
line indentation is also 1)