Add PS environment setup script

Author: geographika

scripts/setdevenv.ps1

@@ -0,0 +1,8 @@
+# This is a very simple script which must be called from a build
+# directory and sets the environment for a Release build
+
+$env:PATH = "$PWD\swig\python\bin;$PWD\apps\Release;$PWD\Release;" + $env:PATH
+$env:GDAL_DATA = "$PWD\data"
+$env:PYTHONPATH = "$PWD\swig\python"
+$env:GDAL_DRIVER_PATH = "$PWD\gdalplugins\Release"
+$env:USE_PATH_FOR_GDAL_PYTHON = "yes"