Appveyor configuration tweaks

- Re-order variables and jobs for Appveyor "Job name" display.
- Enable emails to core-talk on build failures.

.appveyor.yml

@@ -31,24 +31,24 @@ configuration:
   - dynamic-debug
   - static-debug
 
+# Default OS Image
+image: Visual Studio 2019
+
 # Environment variables: compiler toolchain, base version, setup file, ...
 environment:
   # common / default variables for all jobs
   SETUP_PATH: .ci-local:.ci
 
   matrix:
-  - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+  - BASE: 3.15
     CMP: vs2019
-    BASE: 3.15
-  - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+  - BASE: 7.0
     CMP: vs2019
-    BASE: 7.0
-  - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-    CMP: vs2017
-    BASE: 7.0
-  - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+  - BASE: 7.0
     CMP: gcc
-    BASE: 7.0
+  - BASE: 7.0
+    CMP: vs2017
+    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
 
 # Platform: processor architecture
 platform:
@@ -94,4 +94,8 @@ on_failure:
 #---------------------------------#
 
 notifications:
+  - provider: Email
+    to:
+      - core-talk@aps.anl.gov
+    on_build_success: false
   - provider: GitHubPullRequest