[bug #64018] [man, mdoc] decide on a common base paragraph indentation

[G. Branden Robinson]

Follow-up Comment #5, bug #64018 (project groff):

To summarize, this ticket contemplates two new registers for man(7), and
restricted meaning for the `IN` register, first exposed/documented by
Documenter's Workbench (DWB) 1.0 in 1984.

* BP: base paragraph indentation configures how far the left margin of a
normal paragraph is inset from the page offset (which is 0 on terminals) when
no relative insets are active.
* IN: the "standard indentation" would now configure only the default
indentation increment used for relative inset.
* TS: the "tag spacing" configures the size the of the gap that is required
after a paragraph tag.  Effectively, this amount is added to the width of the
diversion created by the `IP` and `TP` macros to format the tag.  If that
amount is greater than the standard indentation, a break is emitted and the
remainder of the paragraph is formatted starting on a new output line,
indented by the `IN` increment.

Presently, groff man(7) acts as if BP=IN=7n (7.2n on typesetters), and TS is
1n.

For consistent rendering of mdoc(7) pages, these parameters (if set) would be
honored by that macro package too, as `SN` and `IN` already are, where
comparable macro semantics permit.


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