Issue #2198 - completely override the Path and PythonPath in the environment.

- PythonPath is specific to CAVE and will not normally be set
- What is currently set in Path is not relevant because we are running ported code


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msi/VizLauncher/VizLauncher/com/raytheon/viz/launcher/process/AbstractProcessLauncher.cs

@@ -56,11 +56,10 @@ namespace VizLauncher.com.raytheon.viz.launcher.process
         {
             ProcessStartInfo processStartInfo = 
                 new ProcessStartInfo(this.constructProcessName(vizEnvironment.getLocation()));
-            processStartInfo.EnvironmentVariables.Remove(EnvironmentProperties.ENVIRONMENT_VARIABLE_PATH);
-            processStartInfo.EnvironmentVariables.Add(
-                EnvironmentProperties.ENVIRONMENT_VARIABLE_PATH, vizEnvironment.getPath());
-            processStartInfo.EnvironmentVariables.Add(
-                EnvironmentProperties.ENVIRONMENT_VARIABLE_PYTHON_PATH, vizEnvironment.getPythonPath());
+            processStartInfo.EnvironmentVariables[EnvironmentProperties.ENVIRONMENT_VARIABLE_PATH] =
+                vizEnvironment.getPath();
+            processStartInfo.EnvironmentVariables[EnvironmentProperties.ENVIRONMENT_VARIABLE_PYTHON_PATH] =
+                vizEnvironment.getPythonPath();
             processStartInfo.UseShellExecute = false;
             processStartInfo.Arguments = this.getCommandLineArguments();
             processStartInfo.RedirectStandardOutput = true;