* __content__ can't be used in Python implementation because safe_eval, so use
``0`` from Python implementation instead
* remove postfix from t-call tests because due to implementation details all
whitespace crap following a t-name is added to rendered template in Python
impl, and don't want to normalize whitespace.
* document qweb based (mostly) on JS version
* convert JS qweb tests to (mostly) language-independent XML so they can be
used for JS and Python implementations
* add some more tests (e.g. precedence between t-value and body in t-set)
* remove ``t-import``
* fix parity in foreach(dict) (and rename some variables to make array and
object versions more similar)
Xavier Morel
Raphael Collet