New manuals for rbldns and rbldns-data.

Added new user manuals for the rbldns and rbldns-data tools. Updated
Makefile.am to add these new manuscripts to the build & install
targets.
Patch to fix ghost domain attack vulnerability.

Applied a security patch to fix ghost domain attack vulnerability
CVE-2012-1911, BZ#838761.

 -> http://marc.info/?l=djbdns&m=134269902121506&w=2

The original patch was written by Mr Peter Conrad. While the issue
was created by Mr Mark Johnson. Sincere thanks to both Mark & Peter.