Addition of hander function was_semi_consistent_read

mysql-test/r/partition_innodb_semi_consistent.result:
  post push fix for bug#40595
  Addition of hander function was_semi_consistent_read
  
  Added test result
mysql-test/t/partition_innodb_semi_consistent-master.opt:
  post push fix for bug#40595
  Addition of hander function was_semi_consistent_read
  
  Added test opt file
mysql-test/t/partition_innodb_semi_consistent.test:
  post push fix for bug#40595
  Addition of hander function was_semi_consistent_read
  
  Added test case
sql/ha_partition.cc:
  post push fix for bug#40595
  Addition of hander function was_semi_consistent_read
  
  The lack of was_semi_consistent_read opened a regression
  for bug-31310 when useing a partitioned InnoDB table

mysql-test/t/partition_innodb_stmt.test:
  post push fix for test case for bug#39084.
  
  (must have partitioning...)

Added KEY_BLOCK_SIZE option to I_S.TABLES.CREATE_OPTIONS field


mysql-test/r/information_schema.result:
  test result
mysql-test/t/information_schema.test:
  test case
sql/sql_show.cc:
  Added KEY_BLOCK_SIZE option to I_S.TABLES.CREATE_OPTIONS field

Bug#37671 crash on prepared statement + cursor + geometry + too many open files!
if mysql_execute_command() returns error then free materialized_cursor object.
is_rnd_inited is added to satisfy rnd_end() assertion
(handler may be uninitialized in some cases)


sql/sql_cursor.cc:
  if mysql_execute_command() returns error then free materialized_cursor object.
  is_rnd_inited is added to satisfy rnd_end() assertion
  (handler may be uninitialized in some cases)
sql/sql_select.cc:
  added result check
tests/mysql_client_test.c:
  test case

Removed values with more than 15 significant digits from the test case. Results of 
reading/printing such values using system library functions depend on implementation 
and thus are not portable.

mysql-test/r/type_float.result:
  Removed values with more than 15 significant digits from the test case.
mysql-test/t/type_float.test:
  Removed values with more than 15 significant digits from the test case.

Problem:
 XML syntax parser allowed to use quoted strings as attribute names,
 and tried to put them into parser state stack instead of identifiers.
 After that parser failed, if quoted string contained some slash characters.
Fix:
 - Disallowing quoted strings in regular tags.
 - Allowing quoted string in DOCTYPE declararion, but
 don't push it into parse state stack (just skip it).

Field_varstring::store
      
The code that temporary saved the bitmaps of the read set and the write set so that
it can set it to all columns for debug purposes was not expecting that the
table->read_set and table->write_set can be the same. And was always saving both in 
sequence.
As a result the original value was never restored.
Fixed by saving & restoring the original value only once if the two sets are the
same (in a special set of functions).

mysql-test/r/select.result:
  Bug #37936: test case
mysql-test/t/select.test:
  Bug #37936: test case
sql/item_cmpfunc.cc:
  Bug #37936: don't save/restore twice if the read and write sets are the same
sql/opt_range.cc:
  Bug #37936: don't save/restore twice if the read and write sets are the same
sql/table.h:
  Bug #37936: Make a designated set of functions that save/restore
  both the read and the write sets in a single call.

no conflicts

mysql-test/suite/parts/r/partition_bit_innodb.result:
  updated test result
mysql-test/suite/parts/r/partition_bit_myisam.result:
  updated test result

if table has bit fields then uneven bits(if exist) are stored into null bits place.
So we need to copy null bits in case of uneven bit field presence.


mysql-test/r/type_bit.result:
  test result
mysql-test/t/type_bit.test:
  test case
sql/sql_select.cc:
  if table has bit fields then uneven bits(if exist) are stored into null bits place.
  So we need to copy null bits in case of uneven bit field presence.

added ability for TINY[MEDIUM] text fields 
to be converted to greater subtype during
alter if necessary(altered charset)


mysql-test/r/alter_table.result:
  test result
mysql-test/t/alter_table.test:
  test case
sql/sql_table.cc:
  added ability for TINY[MEDIUM] text fields 
  to be converted to greater subtype during
  alter if necessary(altered charset)