Replace use of global `$user_ID` in favor of `get_current_user_id()`. fixes #25372.
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Links manager: Restrict field length based on DB schema.

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

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git-svn-id: http://core.svn.wordpress.org/trunk@25586 1a063a9b-81f0-0310-95a4-ce76da25c4cd