backport https://github.com/MariaDB/server/pull/88 to 10.0

Added some extra safety asserts in MyISAM key cache.

my_thread_var->init is now:
0 at startup
1 at init
2 when thread dies

Fix was to add a test in Query_log_event::Query_log_event() if we are using
CREATE ... SELECT and in this case use trans cache, like we do on the master.
This avoid using (with doesn't have checksum)

Other things:
- Removed dummy call my_checksum(0L, NULL, 0)
- More DBUG_PRINT
- Cleaned up Log_event::need_checksum() to make it more readable (similar as in MySQL 5.6)
- Renamed variable that was hiding another one in create_table_imp()

Do not attempt to run unix-specific code on Windows

FUNCTIONS/PRIVILEGES DIFFERENTLY'

Fix for bug#11759114 - '51401: GRANT TREATS NONEXISTENT
FUNCTIONS/PRIVILEGES DIFFERENTLY'.

The problem was that attempt to grant EXECUTE or ALTER
ROUTINE privilege on stored procedure which didn't exist
succeed instead of returning an appropriate error like
it happens in similar situation for stored functions or
tables.

The code which handles granting of privileges on individual
routine calls sp_exist_routines() function to check if routine
exists and assumes that the 3rd parameter of the latter
specifies whether it should check for existence of stored
procedure or function. In practice, this parameter had
completely different meaning and, as result, this check was
not done properly for stored procedures.

This fix addresses this problem by bringing sp_exist_routines()
signature and code in line with expectation of its caller.
Conflicts:
	mysql-test/r/grant.result
	mysql-test/t/grant.test
	sql/sp.cc

- since param is quite small store it on stack
- fixed a few memory leaks

 "mtr connect.odbc_postgresql"

The test has performance-schema in the opt file, so it failed when the server was compiled without performance schema.
Make the option loose, then MTR will be able to reach have_perfschema.inc check and will skip the test gracefully.

Problem was that test just takes too long time in slow I/O and triggers
testcase timeout. Reduced the number of operations and inserts to make
test shorter.

--gtid-ignore-duplicates was comparing sequence numbers as 32-bit, so
after 2**32 transactions things would start to fail.

Let mysqld_safe_syslog.cnf force disable error log so that logging to syslog is
not affected by previous log_error setting.

Added handling of --skip-log-error to mysqld_safe.

Merge error on srv0start.cc

Fixed small size limit and added additional information if we reserve
new pages more then 50 times.

Apply fixes for raw devices to XtraDB in MariaDB 10.0

- References changed from mysql.com to mariadb.com/kb
- NDB specfic things removed
- Changed other MySQL related things to MariaDB

Analysis; Problem is that InnoDB does not have support for generating
CURRENT_TIMESTAMP or constant default.

Fix: Add additional check if column has changed from NULL -> NOT NULL
and column default has changed. If this is is first column definition
whose SQL type is TIMESTAMP and it is defined as NOT NULL and
it has either constant default or function default we must use
"Copy" method for alter table.

The --gtid-ignore-duplicates option was not working correctly with row-based
replication. When a row event was completed, but before committing, there
was a small window where another multi-source SQL thread could wrongly try
to re-execute the same transaction, without properly ignoring the duplicate
GTID. This would lead to duplicate key error or out-of-order GTID error or
similar.

Thanks to Matt Neth for reporting this and giving an easy way to reproduce
the issue.

fix the test case for ps-protocol

MDEV-5977 MariaDB 10.0 is not installable on Trusty when "trusty-updates universe" is in sources.list

fix upgrade[2] tests on trusty and utopic: add missing
conflicts/replaces, client-10.0 should conflict/replace client-5.5.

reformat other conflicts/replaces lines to make them easier
to read and merge

in ha_delete_table()
* only convert ENOENT and HA_ERR_NO_SUCH_TABLE to warnings
* only return real error codes (that is, not ENOENT and
  not HA_ERR_NO_SUCH_TABLE)
* intercept HA_ERR_ROW_IS_REFERENCED to generate backward
  compatible ER_ROW_IS_REFERENCED

in mysql_rm_table_no_locks()
* no special code to handle HA_ERR_ROW_IS_REFERENCED
* no special code to handle ENOENT and HA_ERR_NO_SUCH_TABLE
* return multi-table error ER_BAD_TABLE_ERROR <table list> only
  when there were many errors, not when there were many
  tables to drop (but only one table generated an error)

in cmake tests let's treat clang like gcc (same options,
same builtins) in many cases.

* don't check the compiler when
  * testing for -fvisibility=hidden support
  * testing for HAVE_ABI_CXA_DEMANGLE
  * testing for HAVE_GCC_ATOMIC_BUILTINS
  * when removing options with string(replace)
  * when running ${CC} --version (ignore the error instead)
* run ABI checks for clang
* use "canonical" gcc flags for clang
* fix groonga too

Also:

* add cmake detection for gcc __atomic_* builtins. they might be
  supported (__ATOMIC_SEQ_CST is defined), but not for all operand
  sizes. In particular, 64-bit atomic load is problematic on i386
* cache check results for Windows
* remove the test for HAVE_CXXABI_H (HAVE_ABI_CXA_DEMANGLE is
  suffifient)

* new mysqldump option
* add more engines to the "external data engines" list
* redo the check to be able to print the list of engines in --help

in innobase: compilation error on windows
other changes: perfschema merge followup

only columns really stored to database.