Fix of API of dynamic columns (it made uniform and real function used to free the string).

MDEV-4949 - Spider engine causes compilation errors if compiled without
            partitioning

Do not attempt to create innodb_index_stats and innodb_table_stats
if InnoDB is not available.

Moving the code int Item_func_regex::fix_length_and_dec().

modified:
  sql/item_cmpfunc.cc
  sql/item_cmpfunc.h

An empty string processing added to mariadb_dyncol_column_count().

Dynamic columns unittest fix.

Correct processing of empty string added to creation dynamic string procedure
List function of numeric format fixed when empty string passed.
Unit test calls changed to new ones.
Unit test added to cmake file.

MDEV4732 - Server crashes on attempt to create a SPIDER table with a
           wrong version of mysql.spider_tables
MDEV4733 - Server crashes on attempt to change engine on a SPIDER table

Merged missing changes from revision
alexander.nozdrin@oracle.com-20111219114211-49pqi0wfs9p4o9yi

MDEV-4133: Review InnoDB tablespace allocation patch by Toshikuni Fukaya. If innodb_use_posix_fallocate is set we use posix_fallocate call to extent tablespace allocation instead of pwrite.

modified:
  storage/connect/tabxml.h

            failed in TABLE_SHARE* tdc_acquire_share(THD*, const char*,
            const char*, const char*, uint, uint, TABLE**)

Removed false assertions.

When multiple threads acquire the same previously unused share,
only one thread shall remove share from unused list (the one that
has was_unused == true). Other threads will ignore this step and
may continue even if share is not yet removed from unused list.

Added partition_exchange test.

Do not set HA_OPTION_PACK_RECORD for InnoDB specific row formats
(e.g. COMPACT, REDUNDANT). Adjusted mysql_compare_tables() accordingly.

sql/sql_partition_admin.cc:
  compilation failures w/o partitioning

  information function. This solve the problem of uninitialised zone
  that was detected by valgrind.

modified:
  storage/connect/myconn.cpp
  storage/connect/odbconn.cpp
  storage/connect/tabfmt.cpp
  storage/connect/tabutil.cpp
  storage/connect/tabwmi.cpp