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