Issue #1995058 by TravisCarden, acbramley, vbouchet: Tableselect "select all" checkbox should be checked on page load if all checkboxes are ticked

Issue #218470 by redndahead, casey, nod_, Albert Volkman | webernet: Fixed Floating tableheader: 'Select all' checkbox not updated.

Issue #363354 by xjm, aspilicious, casey, Boobaa: Fixed Tableselect should only select enabled checkboxes.

- Patch #444344 by kkaefer, sun, Rob Loach: this change introduces a jQuery .once() method which streamlines the way behavior functions work. Previously, we had to manually ensure that an element is only initialized once. Usually, this happens by adding classes and selecting only those elements which do not have that class. However, this process can be separated out into a jQuery ‘filtering’ function which does all the grunt work.

#125030 by kkaefer, quicksketch, dvessel, Steven, and John Resig: Allow compatibility with other JavaScript libraries.

#118026 by kkaefer with fixes from myself: JavaScript translation support and script.js as a default theme JS file to use, if found