Get number-grouping to work again.

Though I stil need to fix the sorting issue, which occurs because I
use string items to represent the range items.

sc/inc/dpgroup.hxx

@@ -127,9 +127,9 @@ typedef ::std::vector<ScDPGroupDimension> ScDPGroupDimensionVec;
 
 class SC_DLLPUBLIC ScDPNumGroupDimension
 {
-    ScDPNumGroupInfo            aGroupInfo;         // settings
+    mutable ScDPNumGroupInfo    aGroupInfo;         // settings
     ScDPDateGroupHelper*        pDateHelper;
-    mutable  ::std::vector< SCROW >            maMemberEntries;
+    mutable std::vector<SCROW>  maMemberEntries;
     mutable bool                bHasNonInteger;     // initialized in GetNumEntries
     mutable sal_Unicode         cDecSeparator;      // initialized in GetNumEntries
 
@@ -148,8 +148,7 @@ public:
     const ScDPDateGroupHelper* GetDateHelper() const    { return pDateHelper; }
 
     const std::vector<SCROW>& GetNumEntries(
-        SCCOL nSourceDim, const ScDPCache* pCache,
-        const std::vector< SCROW >& rOriginal) const;
+        SCCOL nSourceDim, ScDPCache* pCache, const std::vector<SCROW>& rOriginal) const;
 
     void MakeDateHelper( const ScDPNumGroupInfo& rInfo, long nDim, sal_Int32 nPart );
 

sc/source/filter/excel/xepivot.cxx

@@ -549,7 +549,8 @@ void XclExpPCField::InsertNumDateGroupItems( const ScDPObject& rDPObj, const ScD
         if( nDatePart != 0 )
             aTmpDim.MakeDateHelper( rNumInfo, mnFieldIdx, nDatePart );
         const std::vector<SCROW>& aMemberIds = aTmpDim.GetNumEntries(
-            static_cast<SCCOL>( GetBaseFieldIndex() ), aDPData.GetCacheTable().getCache(), aOrignial);
+            static_cast<SCCOL>(GetBaseFieldIndex()),
+            const_cast<ScDPCache*>(aDPData.GetCacheTable().getCache()), aOrignial);
         for ( size_t  nIdx = 0 ; nIdx < aMemberIds.size(); nIdx++ )
         {
             const ScDPItemData* pData = aDPData.GetMemberById(  static_cast< long >( GetBaseFieldIndex() ) , aMemberIds[ nIdx] );