If one bookmaker is a direct decedent of another bookmaker, it is not possible to use
hg merge between the two, since mercurial does not have a fast-forward option like git. The solution is to simply, update. Do note that it seems impossible to update to a bookmark that is half way through the tree. There is great stack overflow question and answer about this.
page gave a 500 error logs said SuspiciousOperation error. access was denied to file
problem was css compressor if more then 1 file was compressed. Reason was a bad media_root setting
iFrame https in a http parent does not qualify but this is good to know - Mozilla blog post
Check in js if in iFrame
Window top === window self
Django timestamp field