Improved PHP binary size and startup speed with GCC4 visibility control (Nuno)

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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MFH: Bump copyright year, 2 of 2.

Remove RPL functions. They were always experimental and lead to crashes.
The underlying functions will be removed from libmysql as of MySQL 6.0, so
it's right time to remove them.

Fix crash with pconnect

Move declarations from the public header file.

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