Complete rewrite.

Signed-off-by: Thomas Hochstein <thh@thh.name>

data/sample.hdr

@@ -0,0 +1,7 @@
+From: John Doe <john-doe@example.com>
+Subject: <%LM> test noreply ignore
+Newsgroups: local.test
+Message-ID: <%n-%y-%m-%d@domain.invalid>
+Posting-frequency: 1d
+Expires: 3m
+Supersedes: yes

data/sample.txt

@@ -0,0 +1,9 @@
+Last-modified: 2010-05-15
+
+This is a test message.
+
+Foo.
+
+Bar.
+
+That's quite enought, isn't it?