Fix UPDATE/DELETE WHERE CURRENT OF to support repeated update and update-

then-delete on the current cursor row.  The basic fix is that nodeTidscan.c
has to apply heap_get_latest_tid() to the current-scan-TID obtained from the
cursor query; this ensures we get the latest row version to work with.
However, since that only works if the query plan is a TID scan, we also have
to hack the planner to make sure only that type of plan will be selected.
(Formerly, the planner might decide to apply a seqscan if the table is very
small.  This change is probably a Good Thing anyway, since it's hard to see
how a seqscan could really win.)  That means the execQual.c code to support
CurrentOfExpr as a regular expression type is dead code, so replace it with
just an elog().  Also, add regression tests covering these cases.  Note
that the added tests expose the fact that re-fetching an updated row
misbehaves if the cursor used FOR UPDATE.  That's an independent bug that
should be fixed later.  Per report from Dharmendra Goyal.

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