With commit 227510e039 (parser cleanup: don't store field properties in LEX,
use Create_field directly) it became possible to create columns DOUBLE(0,0) and alike
- as of 5.5.27, YEAR(2) is deprecated, hence the new warning;
- MDEV-553 - different error code/message on out-of-range autoincrement;
- INSERT IGNORE now produces a warning if a duplicate was encountered (change pushed along with MDEV-553)