Add `overflow-x: auto` styling to `code` and `pre` tags, to allow very long single lines of code to wrap without breaking outside of the bounding box.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5337 9866e705-20ec-0310-96e7-cbb4277adcfb
When calculating a new reply position, ensure we are using raw, unformatted integers. Fixes bug where formatted numeric strings (I.E. with commas; eg: 1,532) were being passed to the `menu_order` property, causing broken pagination on topics with over 1k replies. Fixes #2556.

git-svn-id: https://bbpress.svn.wordpress.org/trunk@5338 9866e705-20ec-0310-96e7-cbb4277adcfb