add IE standards http header to each page

This might help with kicking of IE into the sanity mode...

Matteo Scaramuccia added a comment - 09/Nov/12 4:43 PM
HTH: http://msdn.microsoft.com/en-us/library/ff955275%28v=vs.85%29.aspx

Web developers can also specify a document mode by including instructions in a meta element or HTTP response header:

Webpages that include a meta element (see [HTML]) with an http-equivalent value of X-UA-Compatible.
Webpages that are served with an HTTP header named "X-UA-Compatible".
If both of these instructions are sent, the developer's preference (meta element) takes precedence over the web server setting (HTTP header).

It's not clear - at least to me - if it is better but since HTTP Headers are loaded before anything coming with the payload, it should IMHO works better (read, more stable expected results) without breaking the possibility for theme devs to override that setting.