masquerade 6.x-1.4

Changes since DRUPAL-6--1-3:

• #592558: by mariuss, control for list of users on all sub-tabs.
• #610244: callison, deviantintegral: Menu and Block Quick Switch User Settings Don't Work for 'Anonymous'.
• #657326 by modulist, deviantintegral: Update permissions documentation in the README.
• #713248 by incrn8: Add a CSS class to the masquerade link on the user page.
• #588694 by espie, deviantintegral, rickauer: Add database table descriptions.
• #822098 by coreyp_1: use the theme function to show usernames
• #828984 by siliconmeadow - seperated isn't spelled correctly
• #811560 by deviantintegral, alberto56: Allow masquerading in offline mode if the user has the right permissions.
• #763972: Split switching and unswitching into API functions.
• #822098: Use theme_username() more consistently.
• Fix typo in referer_uri().
• Fix CSRF vulnerability. See SA-CONTRIB-2010-068 - Masquerade - Cross Site Request Forgery