Add dotty graphs of the component hierarchy for Gb and RAN

These graphs show the component hierarchy and which ports of which
component are connected where.

Change-Id: I79badbcdbbf03d69de3a1a18241c7a9537c161bf
diff --git a/doc/gb_stack_fr.dot b/doc/gb_stack_fr.dot
new file mode 100644
index 0000000..f69a264
--- /dev/null
+++ b/doc/gb_stack_fr.dot
@@ -0,0 +1,48 @@
+digraph G {
+	rankdir = LR;
+	label = "Gb protocol stack with NS over FR";
+
+	"BSSGP_BVC_CT" [
+		shape = "record"
+		label = "<f0> BSSGP_BVC_CT | <BSSGP_SP> BSSGP_SP | <BSSGP_SP_SIG> BSSGP_SP_SIG | <BSSGP_PROC> BSSGP_PROC | <GLOBAL> GLOBAL | <MGMT> MGMT | <BVC> BVC"
+	]
+
+	"BSSGP_CT" [
+		shape = "record"
+		label = "<f0> BSSGP_CT | <PROC> PROC | <GLOBAL> GLOBAL | <RIM> RIM | <MGMT> MGMT | <BVC> BVC | <BSCP> BSCP"
+	]
+
+	"NS_CT" [
+		shape = "record"
+		label = "<f0> NS_CT | <NS_SP> NS_SP | <NSVC> NSVC | <NS_CTRL> NS_CTRL | <NSIP_PROC> NSIP_PROC"
+	]
+
+	"NSVC_CT" [
+		shape = "record"
+		label = "<f0> NSVC_CT | <NS_SP> NS_SP | <NSCP> NSCP"
+	]
+
+	"NS_Provider_FR_CT" [
+		shape = "record"
+		label = "<f0> NS_PRovider_FR_CT | <NSE> NSE | <FR> FR | <FR_PROC> FR_PROC"
+	]
+
+	"FR_Emulation_CT" [
+		shape = "record"
+		label = "<f0> FR_Emulation_CT | <CLIENT> CLIENT | <PROC> PROC | <FR> FR"
+	]
+
+	"system" [
+		shape = "record"
+		label = "<f0> system | <FR> FR"
+	]
+
+	"BSSGP_BVC_CT":BVC -> "BSSGP_CT":BVC
+	"BSSGP_CT":BSCP -> "NS_CT":NS_SP
+
+	"NS_CT":NSVC -> "NSVC_CT":NS_SP
+	"NSVC_CT":NSCP -> "NS_Provider_FR_CT":NSE
+	"NS_Provider_FR_CT":FR ->  "FR_Emulation_CT":CLIENT
+	"NS_Provider_FR_CT":FR_PROC ->  "FR_Emulation_CT":PROC
+	"FR_Emulation_CT":FR -> "system":FR
+}