Initial copy of pstools from chem

packages/pstools.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<packages>
+  <package id="pstools" name="PSTools" revision="%version%.1" priority="0" reboot="false">
+    <variable name="version" value="2.45" />
+
+    <check type='logical' condition='or'>
+      <check type='registry' condition='equals' path='HKLM\software\wow6432node\ch.cam.ac.uk\WPKG\pstools' value="%version%"/>
+      <check type='registry' condition='equals' path='HKLM\software\ch.cam.ac.uk\WPKG\pstools' value="%version%"/>
+    </check>
+
+    <!-- the exe is built by https://gitlab.developers.cam.ac.uk/ch/co/wpkg/pstools-nsis; see README contained therein -->
+
+    <install cmd='%software%\pstools\pstools-%version%.exe' />
+
+    <upgrade include='remove' />
+    <upgrade include='install' />
+
+    <remove cmd='%software%\wpkg\tools\waitforprocess.cmd pstools-uninstall.exe' />
+    <remove cmd='cmd /c if exist c:\pstools\pstools-uninstall.exe c:\pstools\pstools-uninstall.exe' />
+    <remove cmd='%software%\wpkg\tools\waitforprocess.cmd pstools-uninstall.exe' />
+  </package>
+</packages>