FT-295 Move ybt.h to utils/dbt.h

its own header

FT-296 Move bytestring class to utils/

descriptor/ft_compare_func pair

update the total size when convering to dbt format.

to help catch these in the future

much space is needed on disk

and upgrade code so there's less complexity in ft/ft_node-serialize.cc

byte boundary.

further simplifying the logic that is contained in
ft/ft_node-serialize.cc

This reverts commit 92557e6b.

toku_dbt_is_infinite(). Also, check for the builtin key comparison
function to get an inlined version to run when possible.

FT-281 Add support for big-endian keys that can be compared using the builtin key comparison function

keys must come from a DBT stored in the ftnode by adding
ftnode_pivot_keys::fill_dbt()

of gcc

safer and more readable.

function