Fix an incorrect test number in the output of the speedtest1.c program.  No
changes to the test algorithms.
Performance optimizations for sqlite3VXPrintf().
Minor performance optimizations in pager.c.
Simplify the sqlite3BtreeKeyFetch() and sqlite3BtreeDataFetch() interfaces
to the storage engine.
Reduce the number of times that OP_Column calls sqlite3VdbeMemMakeWriteable().
Correct the VFS name as reported by the file control when explicitly using the 'win32-longpath' VFS.
Simplifications to the OP_MakeRecord opcode and the sqlite3VdbeSerialPut()
helper function.