Move Japanese man page from nmap-jp to nmap-ja.

jp is the code for the country of Japan (ISO 3166). ja is the code for
the Japanese language (ISO 639). This bug was reported by Christian
Neukirchen.

http://seclists.org/nmap-dev/2012/q4/518

CHANGELOG

@@ -1,5 +1,8 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o Moved the Japanese man page from man1/jp to man1/ja. jp is a country
+  code while ja is a language code. Reported by Christian Neukirchen.
+
 o [NSE] Added mysql-enum script which enumerates valid mysql server
   usernames [Aleksandar Nikolic]
 

Makefile.in

@@ -64,7 +64,7 @@ USE_NLS = @USE_NLS@
 # A space-separated list of language codes supported (for man page
 # installation). The user can install a subset of these with the LINGUAS
 # environment variable or none of them with --disable-nls.
-ALL_LINGUAS = de es fr hr hu it jp pl pt_BR pt_PT ro ru sk zh
+ALL_LINGUAS = de es fr hr hu it ja pl pt_BR pt_PT ro ru sk zh
 # A space-separated list of language codes requested by the user.
 LINGUAS ?= $(ALL_LINGUAS)