2.9 branch, from [12416]

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12417 602fd350-edb4-49c9-b593-d223f7449a82
Update the readme to include new mysql minimum version.

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12419 602fd350-edb4-49c9-b593-d223f7449a82
Fix phpDoc for Comment Meta functions to refer to comments not posts. See #11462 props sirzooro.

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12421 602fd350-edb4-49c9-b593-d223f7449a82
Check MySQL and PHP versions when auto upgrading. Props westi, Denis-de-Bernardy, nacin, caesarsgrunt. see #11464 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12423 602fd350-edb4-49c9-b593-d223f7449a82
Properly handle float timeouts for all transports. Props mdawaffe. fixes #11468 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12425 602fd350-edb4-49c9-b593-d223f7449a82
Fix typo. see #11464

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12427 602fd350-edb4-49c9-b593-d223f7449a82
Delete all comment meta when deleting a comment. Props nacin. fixes #11463 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12429 602fd350-edb4-49c9-b593-d223f7449a82
Delete all comment meta when deleting a comment. Props nacin. fixes #11463 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12431 602fd350-edb4-49c9-b593-d223f7449a82
Add required php and mysql versions to version.php.  Future proof required version check strings.  Props nacin. see #11464 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12433 602fd350-edb4-49c9-b593-d223f7449a82
Make sure dir() returned a dir object. for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12435 602fd350-edb4-49c9-b593-d223f7449a82
Give feedback when Upgrade Plugins is clicked but no plugins are selected. see #10973 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12437 602fd350-edb4-49c9-b593-d223f7449a82
Fix the 'current_user_can' check for 'add-comment' for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12439 602fd350-edb4-49c9-b593-d223f7449a82
Escape percent sign. Props sirzooro. fixes #11476 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12441 602fd350-edb4-49c9-b593-d223f7449a82
Fix typo in edit-tags.php, props nacin, fixes #11350 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12443 602fd350-edb4-49c9-b593-d223f7449a82
Fix typo in edit-tags.php (proper patch), props nacin, fixes #11350 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12445 602fd350-edb4-49c9-b593-d223f7449a82
Fix the scale image check in image editor, fixes #11473 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12447 602fd350-edb4-49c9-b593-d223f7449a82
Fix checkbox and radio styles in IE7/8 and Opera for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12449 602fd350-edb4-49c9-b593-d223f7449a82
Hard code required version in update-core.php. see #11464 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12451 602fd350-edb4-49c9-b593-d223f7449a82
Remove stray paren.  Props demetris. fixes #11485 for 2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12453 602fd350-edb4-49c9-b593-d223f7449a82
2.9

git-svn-id: https://develop.svn.wordpress.org/branches/2.9@12454 602fd350-edb4-49c9-b593-d223f7449a82