make sure that wxProcess always have a valid PID set; add test unit for wxExecute,wxShell,wxProcess based on the code in the console sample; add some more infos/notes in wxProcess docs

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59784 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/utilsunx.cpp

@@ -601,6 +601,8 @@ long wxExecute(char **argv, int flags, wxProcess *process)
     {
         // save it for WaitForChild() use
         execData.pid = pid;
+        if (execData.process)
+            execData.process->SetPid(pid);  // and also in the wxProcess
 
         // prepare for IO redirection