* debian/rules: set DESTDIR (not prefix).
* Do not install ipaddrset.py and secnet.8 executable.
* Fix check for <linux/if_tun.h>.
+ * debian/rules: Support dpkg-buildflags.
+
+ Copyright updates:
+ * Update to GPLv3. Add missing copyright notices and credits.
+ * Get rid of old FSF street address; use URL instead.
+ * Remove obsolete LICENCE.txt (which was for snprintf reimplementation).
+ * Remove obsolete references to Cendio (for old ipaddr.py).
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