Revert [25202] and enforce that wp_add_inline_style() does not want <style> tags.

Prior to 3.7, these tags were not printed (and thus needed to be provided), but only in the admin and when concatenation was enabled. They should never be required. Strip them when we find them and issue a notice for incorrect usage.

props atimmer, georgestephanis.
fixes #24813.

Built from https://develop.svn.wordpress.org/trunk@25786


git-svn-id: http://core.svn.wordpress.org/trunk@25698 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix a misspelling of the filter we're checking for, s/fs_method/filesystem_method/.
My bad. See #22704, [25781].

Built from https://develop.svn.wordpress.org/trunk@25787


git-svn-id: http://core.svn.wordpress.org/trunk@25699 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: first pass at CSS revamp, props iamtakashi. See #25592.
Built from https://develop.svn.wordpress.org/trunk@25788


git-svn-id: http://core.svn.wordpress.org/trunk@25700 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: use correct font name in comment docs, props tenpura. Fixes #25593.
Built from https://develop.svn.wordpress.org/trunk@25789


git-svn-id: http://core.svn.wordpress.org/trunk@25701 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: remove `style` tags from accent color output, following r25786. Fixes #25599, props celloexpressions.
Built from https://develop.svn.wordpress.org/trunk@25790


git-svn-id: http://core.svn.wordpress.org/trunk@25702 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Thirteen: fix description layout on attachment outputs, props obenland. Fixes #25578.
Built from https://develop.svn.wordpress.org/trunk@25791


git-svn-id: http://core.svn.wordpress.org/trunk@25703 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: minor fixes to docs, props celloexpressions. See #25257
Built from https://develop.svn.wordpress.org/trunk@25792


git-svn-id: http://core.svn.wordpress.org/trunk@25704 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use FS_CHMOD_FILE rather than an explicit 0644 in copy_dir() and _copy_dir().

This occurs when we can't copy a file. We chmod it and try again.

see #22704.

Built from https://develop.svn.wordpress.org/trunk@25793


git-svn-id: http://core.svn.wordpress.org/trunk@25705 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Core Updates: Verify that all files we're about to copy are actually writable, when using the direct transport.

Once we begin to copy core files, all bets are off. This allows us to fail early when we'll otherwise need to stop midway through due to permissions issues, which is a particularly bad problem when only some files have permissions issues.

see #22704.

Built from https://develop.svn.wordpress.org/trunk@25794


git-svn-id: http://core.svn.wordpress.org/trunk@25706 1a063a9b-81f0-0310-95a4-ce76da25c4cd
3.7-beta2-25795

Built from https://develop.svn.wordpress.org/trunk@25795


git-svn-id: http://core.svn.wordpress.org/trunk@25707 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In show_message(), only print error data if it is a string.

see #25576, [25775].

Built from https://develop.svn.wordpress.org/trunk@25796


git-svn-id: http://core.svn.wordpress.org/trunk@25708 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Only add error data to the files_not_writable WP_Error if the install already has [25775] and [25796] applied.

see #22704.

Built from https://develop.svn.wordpress.org/trunk@25797


git-svn-id: http://core.svn.wordpress.org/trunk@25709 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid our pre-flight writable checks if get_core_checksums() doesn't exist yet.

Thus, it will not work for 3.6 => 3.7, only 3.7+.

see #22704.

Built from https://develop.svn.wordpress.org/trunk@25798


git-svn-id: http://core.svn.wordpress.org/trunk@25710 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove accidental debug cruft in [25780]. see #22704.

Built from https://develop.svn.wordpress.org/trunk@25799


git-svn-id: http://core.svn.wordpress.org/trunk@25711 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use correct variable. see #22704.

Built from https://develop.svn.wordpress.org/trunk@25800


git-svn-id: http://core.svn.wordpress.org/trunk@25712 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Significantly simplify get_core_checksums(), as the caching and chunking was causing too much grief.

Make sure we only do our pre-flight is_writable check when the file exists.

see #18201. see #22704.

Built from https://develop.svn.wordpress.org/trunk@25801


git-svn-id: http://core.svn.wordpress.org/trunk@25713 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: better logic for featured image HTML output, and add fallback message for focusable anchor elements, for accessibility. Fixes #25325.
Built from https://develop.svn.wordpress.org/trunk@25802


git-svn-id: http://core.svn.wordpress.org/trunk@25714 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: link hover improvements, props sabreuse. See #25054.
Built from https://develop.svn.wordpress.org/trunk@25803


git-svn-id: http://core.svn.wordpress.org/trunk@25715 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: remove excerpts from featured posts, and display full titles instead. Props iamtakashi, closes #25581.
Built from https://develop.svn.wordpress.org/trunk@25804


git-svn-id: http://core.svn.wordpress.org/trunk@25716 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid numerous potential PHP warnings when dealing with the pre-r25801 get_core_checksums() return value.

Warnings included current(), filestat(), and md5_file().

see #18201. see #22704.

Built from https://develop.svn.wordpress.org/trunk@25805


git-svn-id: http://core.svn.wordpress.org/trunk@25717 1a063a9b-81f0-0310-95a4-ce76da25c4cd