Includes 5.6 changesets for:
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Fix for BUG#13489996 valgrind:conditional jump or move depends on uninitialised values-field_blob.
blob_ptr_size was not initialized properly: remove this variable.
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Bug#14021323 CRASH IN FIELD::SET_NULL WHEN INSERTING ROWS TO NEW TABLE
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storage/innobase/handler/handler0alter.cc:
for NEWDATE key_type says unsigned, thus col->prtype says unsigned,
but field->flags says signed. Use the same flag for value retrieval
that was used for value storage.
