Switch to debhelper compatibility level 7

debian/changelog

@@ -18,6 +18,7 @@ dpkg (1.16.1) UNRELEASED; urgency=low
     Closes: #622094
   * Improve deb-split(5) format description by splitting debian-split
     member contents into a list.
+  * Switch to debhelper compatibility level 7.
 
   [ Updated man page translations ]
   * German (Helge Kreutzmann).

debian/compat

@@ -1 +1 @@
-6
+7

debian/control

@@ -9,7 +9,7 @@ Homepage: http://wiki.debian.org/Teams/Dpkg
 Vcs-Browser: http://git.debian.org/?p=dpkg/dpkg.git
 Vcs-Git: git://git.debian.org/git/dpkg/dpkg.git
 Standards-Version: 3.9.1
-Build-Depends: debhelper (>= 6.0.7), pkg-config,
+Build-Depends: debhelper (>= 7), pkg-config,
  gettext (>= 0.18), po4a (>= 0.33.1),
  libncursesw5-dev, zlib1g-dev (>= 1:1.1.3-19.1), libbz2-dev, flex,
  libselinux1-dev (>= 1.28-4) [linux-any],