Switch to relative submodule URLs

This will enable the Git mirror on Jenkins to work (and also
resolve some issues with SSH vs Git vs HTTP protocols)

.gitmodules

@@ -1,24 +1,24 @@
 [submodule "simgear"]
 	path = simgear
-	url = https://git.code.sf.net/p/flightgear/simgear
-	branch = next
+	url = ../simgear
+	branch = release/2018.1
 [submodule "flightgear"]
 	path = flightgear
-	url = https://git.code.sf.net/p/flightgear/flightgear
-	branch = next
+	url = ../flightgear
+	branch = release/2018.1
 [submodule "fgrun"]
 	path = fgrun
-	url = https://git.code.sf.net/p/flightgear/fgrun
+	url = ../fgrun
 	branch = next
 [submodule "fgdata"]
 	path = fgdata
-	url = git://git.code.sf.net/p/flightgear/fgdata
-	branch = next
+	url = ../fgdata
+	branch = release/2018.1
 [submodule "windows-3rd-party"]
 	path = windows-3rd-party
-	url = https://git.code.sf.net/p/flightgear/windows-3rd-party
+	url = ../windows-3rd-party
 	branch = master
 [submodule "getstart"]
 	path = getstart
-	url = https://git.code.sf.net/p/flightgear/getstart
-	branch = next
+	url = ../getstart
+	branch = release/2018.1

release_builder/create-release-branch.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-THIS_RELEASE="2018.1"
-NEXT_RELEASE="2018.2"
+THIS_RELEASE="2017.3"
+NEXT_RELEASE="2017.4"
 SUBMODULES="simgear flightgear fgdata getstart"
 
 #:<< 'COMMENT_END'

version

@@ -1 +1 @@
-2018.2.0
+2018.1.1