- Support tracking for UNIONs, temporary-table based ORDER BYs,
  and both.

-Add analyze_stmt.test/result

MDEV-406: ANALYZE $stmt
- Ported the old patch to new explain code
- New SQL syntax (ANALYZE $stmt)
- ANALYZE UPDATE/DELETE is now supported (because EXPLAIN UPDATE/DELETE is supported)
- Basic counters are calculated for basic kinds of queries
  (still need to see what happens with join buffer, ORDER BY...LIMIT queries, etc)

cannot use &ulint_var (where ulint == unsigned __int64)
where (ulong *) is expected (in uncompress() and in "%lu")

VS doesn't like #ifdefs inside a macro expansion. move them outside

we don't have closed-source plugins

This patch allows up to 64K pages for tables with DYNAMIC, COMPACT 
and REDUNDANT row types. Tables with COMPRESSED row type allows 
still only <= 16K page size. Note that single row size must be
still <= 16K and max key length is not affected.

on select from I_S.INNODB_CHANGED_PAGES

Analysis: limit_lsn_range_from_condition() incorrectly parses
start_lsn and/or end_lsn conditions.

Fix from SergeyP. Added some test cases.

on select from I_S.INNODB_CHANGED_PAGES

Analysis: limit_lsn_range_from_condition() incorrectly parses
start_lsn and/or end_lsn conditions.

Fix from SergeyP. Added some test cases.

All underlying tables should share the same lock type.