Created by Alexey Kopytov and last modified
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190. By Alexey Kopytov

Manual merge from trunk (conflict in series).

189. By Alexey Kopytov

LP bug #878404: MyISAM repair-by-sort buffer cannot be > 4 GB even on
64-bit architectures
MySQL bug #45702: Impossible to specify myisam_sort_buffer > 4GB on 64
bit machines

The problem was that the code in _create_index_by_sort() and a number of
auxiliary functions was not 64-bit correct.

Fixed by removing unnecessary type casts and changing variable types
where applicable.

This patch also fixes a problem with my_pread() discovered when testing
the bug fix. According to the man page, pread() can return less bytes
than requested even if enough bytes is available in the file. This case
was not handled in my_pread() correctly.

188. By Stewart Smith

merge 5.5.16 port

187. By Stewart Smith

 fix b/mysql-test/r/percona_server_variables_debug.result

186. By Stewart Smith

fix percona_server_variables_release test for fake changes and kill idle transaction

185. By Stewart Smith

merge kill idle txn

184. By Stewart Smith

merge docs warning fixes

183. By Stewart Smith

fix up percona_server_variables_release results for current variables in server

182. By Stewart Smith

fix percona_server_variables_debug.result for current variables in server

181. By Stewart Smith

fix main.mysqld--help-notwin test case in each patch that changes the result of it, instead of just being in mysql-test.diff plus *some* of teh patches taht touched it.

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