Remove most unused captures from nmap-service-probes.

This patch is from Lauri Kokkonen.
http://seclists.org/nmap-dev/2012/q1/219

CHANGELOG

@@ -1,5 +1,10 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o Audited the nmap-service-probes database to remove many unused
+  captures, fixing dozens of bugs with captures either being ignored
+  or two fields erroneously using the same capture. This was done by
+  Lauri Kokkonen.
+
 o [NSE] Added script iax2-brute and supporting IAX2 library that performs
   brute-force password guessing against the Asterisk IAX2 protocol. [Patrik]