Restore original tsquery operation numbering.

Teodor Sigaev <teodor@sigaev.ru>

Commit: 1ec4c7c055ca045c5df6352a4cdacd9aa778e598
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2016-04-08T17:11:30Z
Releases: 9.6.0
Restore original tsquery operation numbering.

As noticed by Tom Lane changing operation's number in commit
bb140506df605fab58f48926ee1db1f80bdafb59 causes on-disk format incompatibility.
Revert to previous numbering, that is reason to add special array to store
priorities of operation. Also it reverts order of tsquery to previous.

Author: Dmitry Ivanov

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