About screen: Only show the pick-a-color section if there are 2 or more of the eight new color schemes available. And only show the eight core schemes.

This hides the section in develop.svn /src's directory (use /build for colors) and when a plugin is manipulating/unregistering colors. In both situations, which are rare, losing the section is fine.

This removes a fallback image as we were previously showing the section in these cases; the rest of the page shows off the design (and color opportunities) well enough on its own to avoid this confusing section.

see #26387.


git-svn-id: https://develop.svn.wordpress.org/trunk@26795 602fd350-edb4-49c9-b593-d223f7449a82
Twenty Fourteen: RTL fixes for the navigation.

props yoavf.
fixes #26200.


git-svn-id: https://develop.svn.wordpress.org/trunk@26796 602fd350-edb4-49c9-b593-d223f7449a82
Move pointer-specific CSS from wp-admin.css to wp-pointer.css.

props ocean90.
fixes #26477.


git-svn-id: https://develop.svn.wordpress.org/trunk@26797 602fd350-edb4-49c9-b593-d223f7449a82