Prepare Drupal 7.68

Per the D7 release schedule we aim to do a maintenance / bugfix release on 2019-12-04.

We can't be 100% certain, but it seems likely this will be Drupal 7.68 unless there's an out-of-band security release in the next few days.

Here are the release notes that drush grn generates since the last tag (with a couple of merge commits removed):

Changes since 7.67:

• #2902430 by stefanos.petrakis, joseph.olstad, SergFromSD, kiamlaluno, Ayesh, mcdruid, alexpott: [PHP 7.1] A non-numeric value encountered in theme_pager()
• #2472025 by stupiddingo, stefanos.petrakis: [D7] Hide toolbar when printing
• #2171113 by Pol, wiifm, mw4ll4c3, David_Rothstein, douggreen, Fabianx: Settings returned via ajax are not run through hook_js_alter()
• #3059391 by Liam Morland: Use drupal_http_build_query() in drupal_http_request()
• #2966335 by mcdruid, dvandijk, David_Rothstein: Avoid DrupalRequestSanitizer not found fatal error when bootstrap phase order is changed
• #3025335 by mcdruid, mfb, joseph.olstad, Fabianx, kiamlaluno, Pol: [PHP 7.3] Cannot change session id when session is active
• #3055805 by mcdruid, greggles, Ayesh, Darren Oh, David_Rothstein, sidharrell, pwolanin, mkalkbrenner, Sweetchuck, YesCT: file.inc generated .htaccess does not cover PHP 7
• #3047412 by mcdruid, Chi, beckydev, DKAN, alexpott, sammuell, rabbitlair, longwave, greggles, interX: Block web.config in .htaccess (and vice-versa)
• #3047844 by mfb, jordanwood, Taran2L: Fix test failures on PHP 5.3
• #3088557: Add mcdruid as provisional Drupal 7 branch maintainer
• #3051370 by Pol, markcarver, Fabianx: Create "scripts" element to align rendering workflow to how "styles" are handled
• Revert "Issue #3051370 by Pol, Fabianx: Create "scripts" element to align rendering workflow to how "styles" are handled"
• #3051370 by Pol, Fabianx: Create "scripts" element to align rendering workflow to how "styles" are handled
• #2814031 by Liam Morland: In drupal_http_request(), allow passing data as array
• #1861604 by hefox, joseph.olstad, Sivaji, mgifford, webchick: Skip module_invoke/module_hook in calling hook_watchdog (excessive function_exist)
• #2666908 by iamEAP, cilefen: HTTP status 200 returned for ”Additional uncaught exception thrown while handling exception”
• #1892654 by Pol, willvincent, Fabianx: D7 Backport: theme_table() should take an optional footer variable and produce
  
• #3009351 by Pol, mfb, BrianLP: [PHP ≥ 7.2] "session_id(): Cannot change session id"
• #2684337 by geoffray, Pol, jweowu, Fabianx: Warning: uasort() expects parameter 1 to be array, null given in node_view_multiple()
• #3035772 by Pol: [Regression] Fix default.settings.php permission

The only other changes which we'll hope to get in relate to MAINTAINERS.txt e.g. #3088938: Update the D7 maintainers list which it doesn't look like we typically document in the CHANGELOG.txt