Update debian/* files

* debian/control: add sparc64 to the architectures list.
This closes Debian bug #560062
* Backport commit f0df31e71a58c6e79ba77c1a9d84b2f38d44bec7 to fix FTBFS.
This closes Debian bug #560516
* debian/control: Update standards-version to 3.8.3.
* debian/control: Lower package priority to optional, matching
the archive override.
* debian/control: add ${misc:Depends} to Depends: lines where
appropriate.
* debian/watch: new file, allows automatic tracking of new
upstream versions.
* debian/source/format: new file, adapt to debian source format "quilt"
* debian/rules: indentation cleanups; use dh_testroot and dh_prep
in clean target.
diff --git a/debian/watch b/debian/watch
new file mode 100644
index 0000000..166cc9c
--- /dev/null
+++ b/debian/watch
@@ -0,0 +1,2 @@
+version=3
+opts="uversionmangle=s/-/./g" http://sf.net/strace/strace-([[:digit:].-]*)\.tar\.bz2