Bump version to 0.13.1, and re-generate autoconf and automake files.

Makefile.in

@@ -14,6 +14,8 @@
 
 @SET_MAKE@
 
+#ACLOCAL_AMFLAGS = -I autoconf-archive/m4
+
 
 
 VPATH = @srcdir@
@@ -418,7 +420,7 @@ noinst_HEADERS = \
 	random_seed.h \
 	strerror_override.h
 
-libjson_c_la_LDFLAGS = -version-info 3:1:0 -no-undefined @JSON_BSYMBOLIC_LDFLAGS@
+libjson_c_la_LDFLAGS = -version-info 4:0:0 -no-undefined @JSON_BSYMBOLIC_LDFLAGS@
 libjson_c_la_SOURCES = \
 	arraylist.c \
 	debug.c \