Normalise SYNOPSIS behaviour after I gave up on following groff's

inconsistent behaviour.  In short:

       Some macros are displayed differently in the SYNOPSIS
       section, particularly Nm, Cd, Fd, Fn, Fo, In, Vt, and Ft.
       All of these macros are output on their own line.  If two
       such dissimilar macros are pair-wise invoked (except for Ft
       before Fo or Fn), they are separated by a vertical space,
       unless in the case of Fo, Fn, and Ft, which are always
       separated by vertical space.

Behaviour ok Jason McIntyre, ingo@.  Fallout will be treated
case-by-case.

I had to clear out some regressions that were testing against groff's
stranger behaviours: these will now break, as we don't care about such
invocations.

Also removed the newline for `Cd' invocation in a non-SYNOPSIS context.

6 files changed, 14 insertions, 124 deletions

diff --git a/regress/mdoc/Cd/cd.in b/regress/mdoc/Cd/cd.in
new file mode 100644
index 00000000..82e6b0a8
--- /dev/null
+++ b/regress/mdoc/Cd/cd.in
@@ -0,0 +1,14 @@
+.Dd $Mdocdate$
+.Dt FOO 1
+.Os
+.Sh NAME
+.Nm foo
+.Nd bar
+.Sh SYNOPSIS
+.Cd "it* at isa? port 0x2e"
+.Cd "it* at isa? port 0x2e"
+.Cd "it* at isa? port 0x2e"
+.Sh DESCRIPTION
+.Cd "it* at isa? port 0x2e"
+.Cd "it* at isa? port 0x2e"
+.Cd "it* at isa? port 0x2e"
diff --git a/regress/mdoc/Fd/fd.in b/regress/mdoc/Fd/fd.in
deleted file mode 100644
index a4a5e0ac..00000000
--- a/regress/mdoc/Fd/fd.in
+++ /dev/null
@@ -1,22 +0,0 @@
-.Dd $Mdocdate$
-.Dt FOO
-.Os
-.Sh NAME
-.Nm foo
-.Nd bar
-.Sh SYNOPSIS
-1
-.Fl
-.Fd 2 3 4
-.Fd 3
-4
-.Sh DESCRIPTION
-1
-.Fd 2
-.Fd 3
-4
-.Sh BLAH
-1
-.Fd 2
-.Fd 3
-4
diff --git a/regress/mdoc/Fn/fn1.in b/regress/mdoc/Fn/fn1.in
deleted file mode 100644
index 02a17aca..00000000
--- a/regress/mdoc/Fn/fn1.in
+++ /dev/null
@@ -1,21 +0,0 @@
-.Dd $Mdocdate$
-.Dt FOO 1
-.Os
-.Sh NAME
-.Nm foo
-.Nd bar
-.Sh SYNOPSIS
-1
-.In 2
-a
-.Fn 3
-.Fn 4 5 6
-.Ar a Fn 4
-5
-.Sh DESCRIPTION
-1
-.In 2
-.Fn 3
-.Fn 3 4 5
-.Ar a Fn 6
-4
diff --git a/regress/mdoc/Fo/fo0.in b/regress/mdoc/Fo/fo0.in
deleted file mode 100644
index 4ff66510..00000000
--- a/regress/mdoc/Fo/fo0.in
+++ /dev/null
@@ -1,32 +0,0 @@
-.Dd $Mdocdate$
-.Dt FOO 1
-.Os
-.Sh NAME
-.Nm foo
-.Nd bar
-.Sh SYNOPSIS
-.Fn b
-a
-.Fo b
-.Fc
-.Fo "a b c"
-.Fc
-.Ft "a"
-.Fo "b c"
-.Fc
-.Ft "a b"
-.Fo "b c" "d e"
-.Fc
-.Sh DESCRIPTION
-.Fn b
-a
-.Fo b
-.Fc
-.Fo "a b c"
-.Fc
-.Ft "a"
-.Fo "b c"
-.Fc
-.Ft "a b"
-.Fo "b c" "d e"
-.Fc
diff --git a/regress/mdoc/Ft/ft0.in b/regress/mdoc/Ft/ft0.in
deleted file mode 100644
index d7f6cc68..00000000
--- a/regress/mdoc/Ft/ft0.in
+++ /dev/null
@@ -1,25 +0,0 @@
-.Dd $Mdocdate$
-.Dt FOO 1
-.Os
-.Sh NAME
-.Nm foo
-.Nd bar
-.Sh SYNOPSIS
-.Fn b \" Get this out of the way.
-.Ft a
-.Ft b
-a
-.Ft "c d"
-b
-.Ar foo
-.Ft "c d"
-.Ar bar
-.Sh DESCRIPTION
-.Ft a
-.Ft b
-a
-.Ft "c d"
-b
-.Ar foo
-.Ft "c d"
-.Ar bar
diff --git a/regress/mdoc/In/in.in b/regress/mdoc/In/in.in
deleted file mode 100644
index 28831768..00000000
--- a/regress/mdoc/In/in.in
+++ /dev/null
@@ -1,24 +0,0 @@
-.\" THIS WILL PUKE HORRIBLY ON OLD GROFF, WHICH HAS COMPLETELY
-.\" DIFFERENT ("BAD") BEHAVIOUR.
-.Dd $Mdocdate$
-.Dt FOO 1
-.Os
-.Sh NAME
-.Nm foo
-.Nd bar
-.Sh SYNOPSIS
-1
-.In 2 3
-6
-.In 2 3
-.Qq In 2
-.Fd a
-6
-.In 4
-5
-.Sh DESCRIPTION
-1
-.In 2 3
-6
-.In 4
-5