Fix bug when clearing Bloom filter contents.

This patch fixes a bug that occurred when calling the BiF bloomfilter_clear,
which used to not only clear the underlying bit vector but also set its size to
zero. As a result, subsequent element access or computations using the bit
vector size caused erroneous behavior.

Reported by @colonelxc.

src/probabilistic/BloomFilter.cc

@@ -72,7 +72,7 @@ bool BasicBloomFilter::Empty() const
 
 void BasicBloomFilter::Clear()
 	{
-	bits->Clear();
+	bits->Reset();
 	}
 
 bool BasicBloomFilter::Merge(const BloomFilter* other)
@@ -190,7 +190,7 @@ bool CountingBloomFilter::Empty() const
 
 void CountingBloomFilter::Clear()
 	{
-	cells->Clear();
+	cells->Reset();
 	}
 
 bool CountingBloomFilter::Merge(const BloomFilter* other)

src/probabilistic/CounterVector.cc

@@ -75,9 +75,9 @@ bool CounterVector::AllZero() const
 	return bits->AllZero();
 	}
 
-void CounterVector::Clear()
+void CounterVector::Reset()
 	{
-	bits->Clear();
+	bits->Reset();
 	}
 
 CounterVector::count_type CounterVector::Count(size_type cell) const

src/probabilistic/CounterVector.h

@@ -86,7 +86,7 @@ public:
 	/**
 	 * Sets all counters to 0.
 	 */
-	void Clear();
+	void Reset();
 
 	/**
 	 * Retrieves the number of cells in the storage.