OpenNHRP: 0.7.1 released

Minor change to source NBMA IP decision (does not use aliases now), and fixes to a memory leak and one potential crash.

Change log: http://opennhrp.svn.sourceforge.net/viewvc/\*checkout*/opennhrp/trunk/NEWS
Download sources: http://downloads.sourceforge.net/opennhrp/opennhrp-0.7.1.tar.bz2