Merge pull request #247 from knowledgepoint-devs/modal

Committing tested local changes from live server (fixes for ensuring that an user is always processed by the correct site, fixes debug(message) when message is not a string), plus general exception handling, and admin improvements.
Merge pull request #249 from knowledgepoint-devs/modal

Fix up/down-voting whether the *-img-*vote-* element has children or not, plus improvements to Post admin list view.