Throw warnings, not errors for wrong ROW_FORMAT or KEY_BLOCK_SIZE,
so that any table dump can be loaded.

As of this change, InnoDB supports the following table formats:

ROW_FORMAT=REDUNDANT
	the only format before MySQL/InnoDB 5.0.3
ROW_FORMAT=COMPACT
	the new default format of MySQL/InnoDB 5.0.3
ROW_FORMAT=DYNAMIC
	uncompressed, no prefix in the clustered index record for BLOBs
ROW_FORMAT=COMPRESSED
	like ROW_FORMAT=DYNAMIC, but zlib compressed B-trees and BLOBs;
	the compressed page size is specified by KEY_BLOCK_SIZE in
	kilobytes (1, 2, 4, 8, or 16; default 8)

KEY_BLOCK_SIZE=1, 2, 4, 8, or 16: implies ROW_FORMAT=COMPRESSED;
ignored if ROW_FORMAT is not COMPRESSED

KEY_BLOCK_SIZE=anything else: ignored

The InnoDB row format is displayed in the 4th column (Row_format) of
the output of SHOW TABLE STATUS.  The Create_options column may show
ROW_FORMAT= and KEY_BLOCK_SIZE=, but they do not necessarily have
anything to do with InnoDB.

The table format can also be queried like this:

SELECT table_schema, table_name, row_format
FROM information_schema.tables
WHERE engine='innodb' and row_format in ('Compressed','Dynamic');

When Row_format='Compressed', KEY_BLOCK_SIZE should usually correspond
to the compressed page size.  But the .frm file could be manipulated
to show any KEY_BLOCK_SIZE.

For some reason, INFORMATION_SCHEMA.TABLES.CREATE_OPTIONS does not
include KEY_BLOCK_SIZE.  It does include row_format (spelled in
lowercase).  This looks like a MySQL bug, because the table
INFORMATION_SCHEMA.TABLES probably tries to replace SHOW TABLE STATUS.
I reported this as Bug #35275 <http://bugs.mysql.com/35275>.

ha_innobase::get_row_type(): Add ROW_TYPE_COMPRESSED, ROW_TYPE_DYNAMIC.

ha_innobase::create(): Implement ROW_FORMAT=COMPRESSED and
ROW_FORMAT=DYNAMIC.  Do not throw errors for wrong ROW_FORMAT or
KEY_BLOCK_SIZE, but issue warnings instead.

ha_innobase::check_if_incompatible_data(): Return COMPATIBLE_DATA_NO
if KEY_BLOCK_SIZE has been specified.

innodb.result: Adjust the result for the warning issued for ROW_FORMAT=FIXED.

innodb-zip.test: Add tests.  Query INFORMATION_SCHEMA.TABLES for ROW_FORMAT.