Don't order feeds of search results by relevance.

Allow for orderby=relevance to explicitly request relevance.

fixes #7394.


git-svn-id: https://develop.svn.wordpress.org/trunk@25668 602fd350-edb4-49c9-b593-d223f7449a82
Replace use of global `$user_ID` in favor of `get_current_user_id()`. fixes #25372.

git-svn-id: https://develop.svn.wordpress.org/trunk@25669 602fd350-edb4-49c9-b593-d223f7449a82
Links manager: Restrict field length based on DB schema.

props solarissmoke, vinod-dalvi.
fixes #17296, #12264.


git-svn-id: https://develop.svn.wordpress.org/trunk@25670 602fd350-edb4-49c9-b593-d223f7449a82