We have "too" many releases in 4.x branch, so branches.pic's default

scaling model "got confused" and most of messages become unreadable.
Resolve this problem, by spliting of branches diagram into three
diagrams: head, releng3 and releng4.  It reduces width usage and gives
us more control over scalling control.

share/images/articles/releng/branches-head.pic

@@ -0,0 +1,72 @@
+.\" -*- nroff -*-
+.\" $FreeBSD$
+
+.PS 6
+
+HEAD_3:
+	box width 1.0 "\s-33.0-CURRENT\s+3" dashed
+	move right 4
+	move up .5
+	"\s-1H E A D (Main Development Branch)\s+1"
+
+	line -> down from HEAD_3.s
+RELENG_3_0_0_RELEASE:
+	box width .9 "\s-23.0R\s+2"
+
+	line -> right from RELENG_3_0_0_RELEASE.e
+RELENG_3_1_0_RELEASE:
+	ellipse width .5 "\s-23.1R\s+2"
+
+	line -> right from RELENG_3_1_0_RELEASE.e
+RELENG_3:
+	box width 1.0 "\s-3RELENG_3\s+3" dashed rad 45
+
+	line -> down from RELENG_3_1_0_RELEASE.s
+HEAD_4:
+	box width 1.0 "\s-34.0-CURRENT\s+3" dashed
+
+	line -> right from HEAD_4.e
+RELENG_4_0_0_RELEASE:
+	ellipse width .5 "\s-24.0R\s+2"
+
+	line -> right from RELENG_4_0_0_RELEASE.e
+RELENG_4:
+	box width 1.0 "\s-3RELENG_4\s+3" dashed rad 45
+
+	line -> down from RELENG_4_0_0_RELEASE.s
+HEAD_5:
+	box width 1.0 "\s-35.0-CURRENT\s+3" dashed
+	line -> right from HEAD_5.e
+
+RELENG_5_0_0_RELEASE:
+	ellipse width .5 "\s-25.0R\s+2"
+	line -> down from RELENG_5_0_0_RELEASE.s
+
+RELENG_5_0:
+	box width .9 "\s-3RELENG_5_0\s+3" dashed
+	line -> right from RELENG_5_0_0_RELEASE.e
+
+RELENG_5_1_0_RELEASE:
+	ellipse width .5 "\s-25.1R\s+2"
+	line -> down from RELENG_5_1_0_RELEASE.s
+
+RELENG_5_1:
+	box width .9 "\s-3RELENG_5_1\s+3" dashed
+	line -> right from RELENG_5_1_0_RELEASE.e
+
+RELENG_5_2_0_RELEASE:
+	ellipse width .5 "\s-25.2R\s+2"
+	line -> down from RELENG_5_2_0_RELEASE.s
+
+RELENG_5_2_1_RELEASE:
+	ellipse width .5 "\s-25.2.1R\s+2"
+	line -> down from RELENG_5_2_1_RELEASE.s
+
+RELENG_5_2:
+	box width .9 "\s-3RELENG_5_2\s+3" dashed
+	line -> right from RELENG_5_2_0_RELEASE.e
+
+HEAD_5_2:
+	box width 1.0 "\s-35.2-CURRENT\s+3" dashed
+
+.PE

share/images/articles/releng/branches-releng3.pic

@@ -0,0 +1,36 @@
+.\" -*- nroff -*-
+.\" $FreeBSD$
+
+.PS 6
+
+RELENG_3_1_0_RELEASE:
+	ellipse width .9 "\s-23.1-RELEASE\s+2"
+        move right 3
+        move up .5
+        "\s-1RELENG_3 (3.x STABLE Branch)\s+1"
+
+	line -> right from RELENG_3_1_0_RELEASE.e
+RELENG_3_2_0_RELEASE:
+	box width .5 "\s-23.2R\s+2"
+
+	line -> right from RELENG_3_2_0_RELEASE.e
+RELENG_3_3_0_RELEASE:
+	box width .5 "\s-23.3R\s+2"
+
+	line -> right from RELENG_3_3_0_RELEASE.e
+RELENG_3_4_0_RELEASE:
+	box width .5 "\s-23.4R\s+2"
+
+	line -> right from RELENG_3_4_0_RELEASE.e
+RELENG_3_5_0_RELEASE:
+	box width .5 "\s-23.5R\s+2"
+
+	line -> right from RELENG_3_5_0_RELEASE.e
+RELENG_3_5_1_RELEASE:
+	box width .5 "\s-23.5.1R\s+2"
+
+	line -> right from RELENG_3_5_1_RELEASE.e
+RELENG_3:
+	box "\s-23-STABLE\s+2"
+
+.PE

share/images/articles/releng/branches-releng4.pic

@@ -0,0 +1,88 @@
+.\" -*- nroff -*-
+.\" $FreeBSD$
+
+.PS 6
+
+RELENG_4_0_0_RELEASE:
+	ellipse width .9 "\s-24.0-RELEASE\s+2"
+        move right 4
+        move up .5
+        "\s-1RELENG_4 (4.x STABLE Branch)\s+1"
+
+	line -> down from RELENG_4_0_0_RELEASE.s
+RELENG_4_1_0_RELEASE:
+	box width .5 "\s-24.1R\s+2"
+
+	line -> down from RELENG_4_1_0_RELEASE.s
+RELENG_4_1_1_RELEASE:
+	box width .5 "\s-24.1.1R\s+2"
+
+	line -> down from RELENG_4_1_1_RELEASE.s
+RELENG_4_2_0_RELEASE:
+	box width .5 "\s-24.2R\s+2"
+
+	line -> right from RELENG_4_2_0_RELEASE.e
+RELENG_4_3_0_RELEASE:
+	ellipse width .5 "\s-24.3R\s+2"
+
+	line -> down from RELENG_4_3_0_RELEASE.s
+RELENG_4_3:
+	box width .9 "\s-3RELENG_4_3\s+3" dashed
+
+	line -> right from RELENG_4_3_0_RELEASE.e
+RELENG_4_4_0_RELEASE:
+	ellipse width .5 "\s-24.4R\s+2"
+
+	line -> down from RELENG_4_4_0_RELEASE.s
+RELENG_4_4:
+	box width .9 "\s-3RELENG_4_4\s+3" dashed
+
+	line -> right from RELENG_4_4_0_RELEASE.e
+RELENG_4_5_0_RELEASE:
+	ellipse width .5 "\s-24.5R\s+2"
+
+	line -> down from RELENG_4_5_0_RELEASE.s
+RELENG_4_5:
+	box width .9 "\s-3RELENG_4_5\s+3" dashed
+
+	line -> right from RELENG_4_5_0_RELEASE.e
+RELENG_4_6_0_RELEASE:
+	ellipse width .5 "\s-24.6R\s+2"
+
+	line -> down from RELENG_4_6_0_RELEASE.s
+RELENG_4_6_2_RELEASE:
+	ellipse width .5 "\s-24.6.2R\s+2"
+	line -> down from RELENG_4_6_2_RELEASE.s
+
+RELENG_4_6:
+	box width .9 "\s-3RELENG_4_6\s+3" dashed
+
+	line -> right from RELENG_4_6_0_RELEASE.e
+
+RELENG_4_7_0_RELEASE:
+	ellipse width .5 "\s-24.7R\s+2"
+	line -> down from RELENG_4_7_0_RELEASE.s
+
+RELENG_4_7:
+	box width .9 "\s-3RELENG_4_7\s+3" dashed
+	line -> right from RELENG_4_7_0_RELEASE.e
+
+RELENG_4_8_0_RELEASE:
+	ellipse width .5 "\s-24.8R\s+2"
+	line -> down from RELENG_4_8_0_RELEASE.s
+
+RELENG_4_8:
+	box width .9 "\s-3RELENG_4_8\s+3" dashed
+	line -> right from RELENG_4_8_0_RELEASE.e
+
+RELENG_4_9_0_RELEASE:
+	ellipse width .5 "\s-24.9R\s+2"
+	line -> down from RELENG_4_9_0_RELEASE.s
+
+RELENG_4_9:
+	box width .9 "\s-3RELENG_4_9\s+3" dashed
+	line -> right from RELENG_4_9_0_RELEASE.e
+
+RELENG_4:box "\s-24-STABLE\s+2"
+
+.PE