Ex-pat postings are a bit like a revolving door; there’s always someone coming, someone going, entering, exiting, getting stuck with their nose pressed against the glass with a look of horrified Oh-My-God-I’ve-Just-Made-The-Worst-Mistake-of-My-Life on their face.  Spinning around, sometimes missing the chance to jump out, sometimes escaping to the lobby for a few years of respite,…