(1) Remove devel/subversion18

(2) Intoroduce devel/subversion19 from latest pre-1.10 devel/subversion
 (3) Rework all addons to unify versioning code.
     FLAVORS is not used because it will conflict with Python FLAVORS
 (4) Restore mod_dontdothat for www/mod_dav_svn

java/java-subversion/Makefile

@@ -3,18 +3,10 @@
 
 PKGNAMEPREFIX=	java-
 CATEGORIES=	java
-PORTREVISION=	0
 
 MAINTAINER=	lev@FreeBSD.org
 COMMENT=	Java bindings for Version control system
 
-.if defined(WITH_SUBVERSION_VER) && ${WITH_SUBVERSION_VER} == 18
-MASTERDIR=	${.CURDIR}/../../devel/subversion18
-.else
-MASTERDIR=	${.CURDIR}/../../devel/subversion
-.endif
-PKGDIR=		${.CURDIR}
-
 USES+=		compiler
 
 USE_JAVA=	yes
@@ -23,10 +15,13 @@ JAVA_OS=	native
 JAVA_BUILD=	yes
 JAVA_RUN=	yes
 
-SVN_BUILD_BINDINGS=	yes
-SVN_BUILD_ADDONS=	yes
 
-.include "${MASTERDIR}/Makefile.common"
+PORTREVISION_110=	1
+PORTREVISION_19=	0
+
+SVN_BUILD_BINDINGS=	yes
+
+.include "${.CURDIR}/../../devel/subversion/Makefile.addons"
 
 CONFIGURE_ARGS+=	--enable-javahl \
 			--with-jdk=${JAVA_HOME} \