Move SbtAccess to our own package below sbt to prevent accidental namespace clashes with other plugins / sbt

src/main/scala/net/virtualvoid/sbt/graph/util/AsciiTreeLayout.scala

@@ -5,6 +5,8 @@
  */
 package net.virtualvoid.sbt.graph.util
 
+import sbt.dependencygraph.SbtAccess
+
 object AsciiTreeLayout {
   // [info] foo
   // [info]   +-bar
@@ -52,7 +54,7 @@ object AsciiTreeLayout {
   }
 
   def defaultColumnSize: Int = {
-    val termWidth = sbt.SbtAccess.getTerminalWidth
+    val termWidth = SbtAccess.getTerminalWidth
     if (termWidth > 20) termWidth - 8
     else 80 // ignore termWidth
   }

src/main/scala/sbt/dependencygraph/SbtAccess.scala

@@ -14,17 +14,13 @@
  *    limitations under the License.
  */
 
-package sbt
+package sbt.dependencygraph
 
-import internal._
-import Classpaths._
-import LibraryManagement._
-import internal.util.JLine
+import sbt.Defaults
 
 /** Accessors to private[sbt] symbols. */
 object SbtAccess {
   val unmanagedScalaInstanceOnly = Defaults.unmanagedScalaInstanceOnly
 
-  def getTerminalWidth: Int = JLine.usingTerminal(_.getWidth)
-
+  def getTerminalWidth: Int = sbt.internal.util.JLine.usingTerminal(_.getWidth)
 }

src/sbt-test/sbt-dependency-graph/build.properties

@@ -1 +0,0 @@
-sbt.version=0.13.6