move a few Install builder tests to Copy builder

build_tests/typical/copy_directory.rb

@@ -0,0 +1,11 @@
+build do
+  Environment.new do |env|
+    env.Directory("copy")
+    env.Copy("copy", "copy_directory.rb")
+
+    env.Copy("noexist/src", "src")
+
+    env.Directory("exist/src")
+    env.Copy("exist/src", "src")
+  end
+end

build_tests/typical/install_directory.rb

@@ -1,11 +0,0 @@
-build do
-  Environment.new do |env|
-    env.Directory("inst")
-    env.Install("inst", "install_directory.rb")
-
-    env.Install("noexist/src", "src")
-
-    env.Directory("exist/src")
-    env.Install("exist/src", "src")
-  end
-end