Use .In instead of .Ar Pa for header files.

Add missing prototype for set_max_field() and bump date.
From xs at kittenz dot org in PR/18668.

Mark up NULL.

Bump date for previous; mark up defined values with Dv;
use Aq instead of \*[Lt]\*[Gt].

* Rewrote internal handling of multiline field line data to fix a bug
where a newly opened line would immediately get wrapped out of existence.
The old method of handling lines in a multiline fie

* Rewrote internal handling of multiline field line data to fix a bug
where a newly opened line would immediately get wrapped out of existence.
The old method of handling lines in a multiline field did not cope with
this elegantly.

* Added new field flag O_REFORMAT which, when set, returns the field
buffer with newlines inserted where the line wrapped. Previously, there
was no way of preserving the on screen format of a multiline field.

* Added new file gdbinit which contains a macro to verify and print
the multiline field line data structure.

* Bumped libform major number due to changes in the _form_field structure.

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Use
.In header.h
instead of
.Fd #include \*[Lt]header.h\*[Gt]
Much easier to read and write, and supported by groff for ages.
Okayed by ross.

New sentence, new line. From Robert Elz.

Added extension to interface, set_field_printf which allows a printf
style setting of field buffers.

The argument of .Fn should look like this:
.Fn function_name "int first" "char *second"
not like this:
.Fn function_name "int first, char *second".

Normalize Dd.

Generate <>& symbolically.

Whitespace nits.

Add man pages for libform.