Resolves: fdo#63426 presentation wizard crashes

This effectively reverts the code parts of
13e8f68e82
"fix memory leak and add some documentation"

Change-Id: I66fa052f79185e1348c14e99954b04bf0a4622e5

sfx2/inc/sfx2/docfile.hxx

@@ -71,6 +71,9 @@ class SFX2_DLLPUBLIC SfxMedium : public SvRefBase
 public:
 
                         SfxMedium();
+                        /**
+                         * @param pSet Takes ownership
+                         */
                         SfxMedium( const String &rName,
                                    StreamMode nOpenMode,
                                    const SfxFilter *pFilter = 0,

sfx2/source/appl/appopen.cxx

@@ -375,8 +375,8 @@ sal_uIntPtr SfxApplication::LoadTemplate( SfxObjectShellLock& xDoc, const String
         if ( !xDoc.Is() )
             xDoc = SfxObjectShell::CreateObject( pFilter->GetServiceName() );
 
+        //pMedium takes ownership of pSet
         SfxMedium *pMedium = new SfxMedium( rFileName, STREAM_STD_READ, pFilter, pSet );
-        delete pSet;
         if(!xDoc->DoLoad(pMedium))
         {
             ErrCode nErrCode = xDoc->GetErrorCode();