Jeremy Felt f69396c229 MS: Provide better UI when a main site's /blog prefix is changed.
The main site on a new network is forced by default into using `/blog` as the prefix for its permalink structure. This can be changed easily through the network admin, though the `options-permalink.php` screen is then unusable to make further changes to the structure.

Now, if `/blog/` is not at the beginning of the `permalink_structure` option, we do not force `/blog` as a prefix in the UI.

Fixes #12002.

Built from https://develop.svn.wordpress.org/trunk@34749


git-svn-id: http://core.svn.wordpress.org/trunk@34714 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2015-10-01 20:39:24 +00:00
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2015-06-27 15:41:25 +00:00