Only show output from multiple commands when required

Only show output from multiple commands when required

After the previous commit:
    Fix importing of branches into RCS
a command may be made up of multiple commands.  Ensure that output from
all commands is only shown when verbose level warrants it.

Test case:

$ cat test-04-branches.fastexp
commit refs/heads/master
mark :1
committer Joe Bloggs <joe.bloggs@example.com> 999091736 +0100
data 13
Add file.txt

M 644 inline file.txt
data 51
Contents of file.txt, changeset 1/3, branch master

commit refs/heads/b1
mark :2
committer Joe Bloggs <joe.bloggs@example.com> 999098479 +0100
data 29
Update file.txt on branch b1

from :1
M 644 inline file.txt
data 47
Contents of file.txt, changeset 2/3, branch b1

commit refs/heads/master
mark :3
committer Joe Bloggs <joe.bloggs@example.com> 999098479 +0100
data 33
Update file.txt on branch master

from :1
M 644 inline file.txt
data 51
Contents of file.txt, changeset 3/3, branch master

$ rcs-fast-import < test-04-branches.fastexp
RCS file: RCS/file.txt,v
1.1.1.1 unlocked
done
RCS file: RCS/file.txt,v
1.1 locked
done