Make request method per-container

[david]

So that you can, for example, force a slot to run with read, because your slotted login action in the sidebar otherwise tries to perform a login when a POST is performed to the register action or so.

This should be possible w/o BC break. Copy request method to the container, add argument to create*Container(), done.

[david]

(In [2495]) implemented per-container request methods, closes #667

[david]

• By default, all newly created containers use the global request method
• AgaviController::createExecutionContainer() now has a new argument for the request method
• AgaviExecutionContainer::createExecutionContainer() (and thus AgaviView::createForwardContainer() and AgaviView::createSlotContainer()) copy their own request method into the newly created containers (just like they do with the output type)
• in output_types.xml layout definitions, you may now use <slot ... method="read" /> to conveniently force a request method for a slot

[david]

Backporting to 0.11.3 due to popular demand

[david]

I looked at it again, and it turned out it's a bad idea due to the coupling of this feature to the changes related to #767

[david]

(In [3455]) UPGRADING info for per-container request methods, refs #667