Compressed protocol support + extensibility for mysqlnd

Move definition

Fix (by Andrey) and test for bug #49442 . Don't use efree() for memory allocated with malloc()... If a connection gets created by mysqli_init(), mysqlnd makes it 'persistent'. 'Persistent' means that

Fix (by Andrey) and test for bug #49442 . Don't use efree() for memory allocated with malloc()... If a connection gets created by mysqli_init(), mysqlnd makes it 'persistent'. 'Persistent' means that mysqlnd uses malloc(). mysqlnd does use malloc() instead of ealloc() because it is unknown if the connection will become a true persistent connection in the sense of ext/mysqli. It is unknown if the user wants a persistent connection or not until the user calls mysqli_real_connect(). To avoid tricky conversions mysqlnd uses malloc(), which sets a private persistent flag in the mysqlnd structures. A precondition for the crash to happen was that the private persistent flag is set. The flag is also set when creating a real persistent connection (in the sense of ext/mysqli) and so the bug can happen with mysql_init()/mysqli_real_connect() and mysql_connect('p:<host>', ...). Therefore we test both cases. Note the (tricky?) difference between the implementation detail'mysqlnd private persistent flag = use malloc()' and persistent connections from a user perspective. Although mysqlnd will always set its private persistent flag and use malloc() for connections created with mysqli_init() it is still up to the user to decide in mysqli_real_connect() if the connection shall become a (true) persistent connection or not.

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- MFH: Improve mysqlnd's internal method registration

MFH: Bump copyright year, 3 of 3.

MFH:
Get rid of many defines (which simplifies the code a lot),
as well as uint->unsigned int

MFB:
64bit fixes:
- fixes to sprintf modifiers, cleaning warnings
- use _t types, like uint64_t instead of uint64, thus skipping series of
typedefs.

MFH: constify strings

Update ext/mysql's and ext/mysqli's tests
Add mysqli_stmt_more_result()/mysqli_stmt_next_result(), but only in
mysqlnd builds as libmysql doesn't support this feature.

Fixed a bunch of bugs reported in
Bug #44352 mysqli_connect_error() false negative for host errors
From now on the mysqli object doesn't have that magic properties, like
error, which were

Fixed a bunch of bugs reported in
Bug #44352 mysqli_connect_error() false negative for host errors
From now on the mysqli object doesn't have that magic properties, like
error, which were readable but not visible through isset(), property_exists()
and var_dump(). All other ext/mysqli classes were fixed too.
Now it will be easier to debug mysqli based applications.

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new 6.0 flag

some config.w32 fixes
moved mysqlnd's block allocator to a separate file and also now
it's part of the connection, no MT problems.

More optimizations - less MM calls
Clearly separated fetching (physical reading) from decoding phases (data
interpretation). Threaded fetching added but disabled as needs more work for
Wi

More optimizations - less MM calls
Clearly separated fetching (physical reading) from decoding phases (data
interpretation). Threaded fetching added but disabled as needs more work for
Windows. For Linux needs some touches to add pthreads if this is enabled,
probably with a compile-time switch.
The code reorganisation makes it easy to add also async API, similar to
cURL's one.

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Merge with internal version

strncpy->strlcpy

- Fix problems with double definitions
- Clean up a bit a type mess - 4 types less. No need to have aliases
for the same thing (unification is the name).
- New macro for Johannes mysqln

- Fix problems with double definitions
- Clean up a bit a type mess - 4 types less. No need to have aliases
for the same thing (unification is the name).
- New macro for Johannes mysqlnd_stmt_ro_result_metadata

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MFH: Bump copyright year, 2 of 2.

Sync mysqlnd. Should still compile with 5_2 for those who want to use the
current stable branch. mysqli from 5_3 patched for mysqlnd should be also
compilable with 5_2.

Import mysqlnd
Patch ext/mysql and ext/mysqli to support mysqlnd