Appveyor testing expanded

- New variable to control version of Visual Studio to use on appveyor
- Enable VS2015 (14.0) for C#
- Run full check-test-suite and not just partialcheck-test-suite since
  Appveyor performance improvements since using dedicated Hyper-V
  instead of Azure.
- Allow 64 bit Python 2.7 to fail on Appveyor as a vector container
  slicing bug needs fixing.

appveyor.yml

@@ -5,13 +5,26 @@ platform:
 environment:
   matrix:
   - SWIGLANG: csharp
+    VSVER: 14
+  - SWIGLANG: csharp
+    VSVER: 12
   - SWIGLANG: java
+    VSVER: 12
   - SWIGLANG: python
+    VSVER: 12
     VER: 27
   - SWIGLANG: python
+    VSVER: 12
     VER: 34
     PY3: 1
 
+matrix:
+  allow_failures:
+    - platform: x64
+      SWIGLANG: python
+      VSVER: 12
+      VER: 27
+
 install:
 - date /T & time /T
 - set PATH=C:\cygwin\bin;%PATH%
@@ -30,7 +43,9 @@ install:
       $env:VCVARS_PLATFORM="amd64"
       $env:LANG_PLATFORM="-x64"
     }
-- call "%VS120COMNTOOLS%\..\..\VC\vcvarsall.bat" %VCVARS_PLATFORM%
+- ps: $env:VSCOMNTOOLS=(Get-Content ("env:VS" + "$env:VSVER" + "0COMNTOOLS"))
+- echo "Using Visual Studio %VSVER%.0 at %VSCOMNTOOLS%"
+- call "%VSCOMNTOOLS%\..\..\VC\vcvarsall.bat" %VCVARS_PLATFORM%
 - nuget install pcre -Verbosity detailed -Version 8.33.0.1 -OutputDirectory C:\pcre
 - set PCRE_ROOT=C:/pcre/pcre.8.33.0.1/build/native
 - set PATH=C:\Python%VER%%LANG_PLATFORM%;%PATH%
@@ -64,7 +79,7 @@ test_script:
 - bash -c "file ./swig.exe"
 - bash -c "time make -k check-%SWIGLANG%-version"
 - bash -c "time make -k check-%SWIGLANG%-examples %CHECK_OPTIONS%"
-- bash -c "time make -k partialcheck-%SWIGLANG%-test-suite %CHECK_OPTIONS%"
+- bash -c "time make -k check-%SWIGLANG%-test-suite %CHECK_OPTIONS%"
 
 # Do not build on tags (GitHub only)
 skip_tags: true