tmac: introduce real manual reference macro instead of overloading IR

The overloading of IR emits magic \X'...' sequences that turn into HTML manual links.
But not all such IR invocations should be manual links;
those had to be written to avoid the IR macro before.
Worse, the \X'...' ending the IR causes troff to emit only a single space after a period.

Defining a new IM macro for manual references fixes both problems.

Fixes #441.

1 files changed, 8 insertions, 8 deletions

diff --git a/man/man1/deroff.1 b/man/man1/deroff.1
index 9d159f9e..90fba52d 100644
--- a/man/man1/deroff.1
+++ b/man/man1/deroff.1
@@ -16,13 +16,13 @@ reads each file in sequence
 and removes all
 .I nroff
 and
-.IR troff (1)
+.IM troff (1)
 requests and non-text arguments, backslash constructions,
 and constructs of preprocessors such as
-.IR eqn (1),
-.IR pic (1),
+.IM eqn (1) ,
+.IM pic (1) ,
 and
-.IR tbl (1).
+.IM tbl (1) .
 Remaining text is written on the standard output.
 .I Deroff
 follows files included by
@@ -67,7 +67,7 @@ requests.
 Remove titles, attachments, etc., as well as ordinary 
 .IR troff
 constructs, from
-.IR ms (7)
+.IM ms (7)
 or
 .I mm
 documents.
@@ -84,7 +84,7 @@ does for
 and
 .I latex
 (see
-.IR tex (1))
+.IM tex (1) )
 files what
 .B deroff -wi
 does for
@@ -96,8 +96,8 @@ files.
 .B \*9/src/cmd/delatex.lx
 .SH "SEE ALSO"
 .IR troff (1), 
-.IR tex (1),
-.IR spell (1)
+.IM tex (1) ,
+.IM spell (1)
 .SH BUGS
 These filters are not complete interpreters of
 .I troff