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.
Fix handling of errors returned by the SQLITE_FCNTL_OMIT_SYNCED file-control.
Merge changes from the trunk.
Use SQLITE_FCNTL_SYNC instead of SQLITE_FCNTL_SYNC_OMITTED. Add documentation in for FCNTL_SYNC and FCNTL_COMMIT_PHASETWO.