dtmail: resolve coverity warnings related to uninitialised members in C++ classes

cde/programs/dtmail/MotifApp/Application.C

@@ -149,6 +149,10 @@ Application::Application ( char *appClassName ) :
     _numWindows = 0;
     _shutdownEnabled = 1;
     _applicationClass = strdup ( appClassName );
+    _appWorkspaceList = NULL;
+    _lastInteractiveEventTime = 0;
+    _originalEgid = 0;
+    _originalRgid = 0;
 }
 
 void Application::initialize ( int *argcp, char **argv )

cde/programs/dtmail/MotifApp/BusyPixmap.C

@@ -69,7 +69,9 @@
 #define PIXMAPSIZE  50
 
 BusyPixmap::BusyPixmap ( Widget w ) : 
-        PixmapCycler ( NUMPIXMAPS, PIXMAPSIZE, PIXMAPSIZE )
+        PixmapCycler ( NUMPIXMAPS, PIXMAPSIZE, PIXMAPSIZE ),
+        _gc(NULL),
+        _inverseGC(NULL)
 {
     _w = w;
 }

cde/programs/dtmail/MotifApp/Cmd.C

@@ -82,6 +82,7 @@ Cmd::Cmd ( char *name, char *label, int active )
     _activationList    = NULL;
     _deactivationList  = NULL;
     _hasUndo           = TRUE;
+    _previouslyActive  = 0;
 
     if (label) {
 	_label         = strdup(label);

cde/programs/dtmail/MotifApp/CmdList.C

@@ -82,6 +82,7 @@ CmdList::CmdList(char *name, char *label ) : Cmd(name, label, 1)
     
     _contents    = 0;
     _numElements = 0;
+    _pane        = NULL;
 }
 
 CmdList::~CmdList()

cde/programs/dtmail/MotifApp/MainWindow.C

@@ -107,6 +107,10 @@ MainWindow::MainWindow( char *name, Boolean allowResize ) : UIComponent ( name )
     _window_invert = NULL;
     _icon = 0;
     _allow_resize = allowResize;
+    _last_state = 0;
+    _flash_owin = 0;
+    _flash_iwin = 0;
+    memset(&_window_attributes, 0, sizeof(XWindowAttributes));
 
     assert ( theApplication != NULL ); // Application object must exist
     // before any MainWindow object

cde/programs/dtmail/MotifApp/SelectFileCmd.C

@@ -108,6 +108,8 @@ SelectFileCmd::SelectFileCmd (const char * name,
     _cancel_clientData = NULL;
     _fileBrowser       = NULL;
     _parentWidget      = parent;
+    _hidden_button     = NULL;
+    _directory         = NULL;
 }
 
 SelectFileCmd::SelectFileCmd (const char * name, 
@@ -130,6 +132,8 @@ SelectFileCmd::SelectFileCmd (const char * name,
     _cancel_clientData = cancel_clientData;
     _fileBrowser       = NULL;
     _parentWidget      = parent;
+    _hidden_button     = NULL;
+    _directory         = NULL;
 }
 
 SelectFileCmd::~SelectFileCmd()