leveldbwrapper: Remove unused .Prev(), .SeekToLast() methods

Also, trim trailing whitespace.

src/leveldbwrapper.cpp

@@ -99,6 +99,4 @@ bool CLevelDBWrapper::IsEmpty()
 CLevelDBIterator::~CLevelDBIterator() { delete piter; }
 bool CLevelDBIterator::Valid() { return piter->Valid(); }
 void CLevelDBIterator::SeekToFirst() { piter->SeekToFirst(); }
-void CLevelDBIterator::SeekToLast() { piter->SeekToLast(); }
 void CLevelDBIterator::Next() { piter->Next(); }
-void CLevelDBIterator::Prev() { piter->Prev(); }

src/leveldbwrapper.h

@@ -60,7 +60,7 @@ public:
         batch.Delete(slKey);
     }
 };
- 
+
 class CLevelDBIterator
 {
 private:
@@ -78,7 +78,6 @@ public:
     bool Valid();
 
     void SeekToFirst();
-    void SeekToLast();
 
     template<typename K> void Seek(const K& key) {
         CDataStream ssKey(SER_DISK, CLIENT_VERSION);
@@ -89,7 +88,6 @@ public:
     }
 
     void Next();
-    void Prev();
 
     template<typename K> bool GetKey(K& key) {
         leveldb::Slice slKey = piter->key();
@@ -122,7 +120,7 @@ public:
     }
 
 };
- 
+
 class CLevelDBWrapper
 {
 private:
@@ -231,7 +229,7 @@ public:
         return WriteBatch(batch, true);
     }
 
-    CLevelDBIterator *NewIterator() 
+    CLevelDBIterator *NewIterator()
     {
         return new CLevelDBIterator(pdb->NewIterator(iteroptions));
     }