sclang side of dev support

git-svn-id: https://supercollider.svn.sourceforge.net/svnroot/supercollider/trunk@9039 a380766d-ff14-0410-b294-a243070f3f08

el/sclang-mode.el

@@ -183,6 +183,7 @@
     "if"
     "ir"
     "kr"
+    "tr"
     "loop"
     "while"
     )

sc/Emacs.sc

@@ -192,6 +192,12 @@ EmacsInterface {
 				[time, \error, e.errorString]
 			}
 		})
+		.put( \openDevSource, { | name |
+			var devpath = thisProcess.platform.devLoc( name );
+			//	devpath.postln;
+			Document.open( devpath ).front;
+			name -> devpath
+		});
 	}
 }