* Remove AST in favor of pure Pyhon. This should make it easier for
developers to understand and create new directives because they do not
need to know AST.
* Remove `t-call-options` as it has been merged into `t-options` for more
consistency. Support for t-call-options is retained.
* Use generators for lists. This increases performances as the rendering
can be sent directly without having to wait for the creation of the
entire list.
* Optimize expressions runtime computation by pre-computing the static
parts.
Example:
'<' + 'div' + '>' + '<' + dynamic_value + '>'
Now compiles as:
'<div><' + dynamic_value + '>'
* 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)
Gorash