Rename the _fletch_system and service and dart: libraries

pkg/fletchc/lib/src/fletch_compiler_implementation.dart

 // Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 library fletchc.fletch_compiler_implementation;
 
 import 'dart:async' show
     EventSink;
 
 import 'package:sdk_library_metadata/libraries.dart' show
@@ skipping 57 matching lines @@
   "convert": "convert/convert_patch.dart",
   "core": "core/core_patch.dart",
   "math": "math/math_patch.dart",
   "async": "async/async_patch.dart",
   "typed_data": "typed_data/typed_data_patch.dart",
 };
 
 const FLETCH_PLATFORM = 3;
 
 const Map<String, LibraryInfo> FLETCH_LIBRARIES = const {
-  "_fletch_system": const LibraryInfo(
+  "fletch._system": const LibraryInfo(
       "system/system.dart",
       categories: "",
       documented: false,
       platforms: FLETCH_PLATFORM),
 
   "fletch.ffi": const LibraryInfo(
       "ffi/ffi.dart",
       categories: "Client,Server,Embedded",
       documented: false,
       platforms: FLETCH_PLATFORM),
 
   "fletch": const LibraryInfo(
       "fletch/fletch.dart",
       categories: "Client,Server,Embedded",
       documented: false,
       platforms: FLETCH_PLATFORM),
 
   "fletch.io": const LibraryInfo(
       "io/io.dart",
       categories: "Client,Server,Embedded",
       documented: false,
       platforms: FLETCH_PLATFORM),
 
-  "system": const LibraryInfo(
-      "io/system.dart",
-      categories: "",
-      documented: false,
-      platforms: FLETCH_PLATFORM),
-
-  "service": const LibraryInfo(
+  "fletch.service": const LibraryInfo(
       "service/service.dart",
       categories: "Client,Server,Embedded",
       documented: false,
       platforms: FLETCH_PLATFORM),
 
   "fletch.os": const LibraryInfo(
       "os/os.dart",
       categories: "Client,Server,Embedded",
       documented: false,
       platforms: FLETCH_PLATFORM),
@@ skipping 218 matching lines @@
   }
 }
 
 SourceFile getSourceFile(api.CompilerInput provider, Uri uri) {
   if (provider is SourceFileProvider) {
     return provider.sourceFiles[uri];
   } else {
     return null;
   }
 }