(chocolateyGH-7) warn when install is not done in admin mode

If the environment variables are being created as USER instead of
SYSTEM, warn the user about this so they can take manual actions if
this is not what they wanted.

nuget/chocolatey/tools/chocolateysetup.psm1

@@ -122,11 +122,15 @@ param(
   [string]$folder
 )
   $environmentTarget = [System.EnvironmentVariableTarget]::User
+  # removing old variable
   Install-ChocolateyEnvironmentVariable -variableName "$chocInstallVariableName" -variableValue $null -variableType $environmentTarget
   if (Test-ProcessAdminRights) {
     Write-Debug "Administrator installing so using Machine environment variable target instead of User."
     $environmentTarget = [System.EnvironmentVariableTarget]::Machine
+    # removing old variable
     Install-ChocolateyEnvironmentVariable -variableName "$chocInstallVariableName" -variableValue $null -variableType $environmentTarget
+  } else {
+    Write-Warning "Setting ChocolateyInstall Environment Variable on USER and not SYSTEM variables.`n  This is due to either non-administrator install OR the process you are running is not being run as an Administrator."
   }
 
   Write-Output "Creating $chocInstallVariableName as an environment variable (targeting `'$environmentTarget`') `n  Setting $chocInstallVariableName to `'$folder`'"
@@ -297,6 +301,8 @@ param(
   if (Test-ProcessAdminRights) {
     Write-Debug "Administrator installing so using Machine environment variable target instead of User."
     $environmentTarget = [System.EnvironmentVariableTarget]::Machine
+  } else {
+    Write-Warning "Setting ChocolateyInstall Path on USER PATH and not SYSTEM Path.`n  This is due to either non-administrator install OR the process you are running is not being run as an Administrator."
   }
 
   Install-ChocolateyPath -pathToInstall "$chocolateyExePath" -pathType $environmentTarget