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  api.

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Changed the response sending api again. It is now possible to effectvly bypass the backend's response handling stuff.

Previously it was not actually possible (though it did look that
way). See the comment at the bottow of src/rerl/protocol.lisp for
details on the now api. as before this is only implemneted for the
httpd backend.

darcs-hash:0ebb06fa98f606a9dcf57201785b6df7a517c612

This change requires changes in the backend which have, atm, only been
implemented for the httpd backend. The dispatcher code has also
changed, the server's handle-request method no longer shutdown's the
response, this must be done inside the various dispatch methods.

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Use a list of dispatchers, instead of entry-poinst and nested service methods, to route incoming requests.

This change moves a lot of the code which was spread out over the
various SERVICE methods into the various dispatch methods. This change
sholud make customizing ucw's request handling code much easier and
reduce the amout of code in general.

darcs-hash:8e659d514dba883a6afce5eddee6252b8a915a64

Renamed simple-container to switching-container, clearly separated the base
container class functionality from the new switching container. After the
refactor it is easier to use switching-container with dynamically
generated content and in situations where the old 'label' property have
no useful meaning (e.g. dinamically built tab pane). By default the new 'key'
property is the component itself.

User API changes (exported symbols):
 - simple-container -> switching-container
 - container.label-test -> container.key-test (also the initarg)
 - container.current-component-name -> container.current-component-key (also the initarg)

Generally 'label' has been renamed to 'key' in container, and switching-container
implementation is based on the component accessing functionality provided by container.

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Widgets are generally used for simple graphical widgets (duh) which
never call/answer, don't use transactions, don't need to remeber their
place, etc. This change makes that distinction exlpcit and saves a lot
of space in terms of what we need to backtracke and what we can safely
forget.

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darcs-hash:5823473eabd4ceb73cf6bab73992026707ea2108

This code, while very cool, belongs in a seperate library and not
inside ucw inself. The wall-time stuff has been dropped as well.

The code is now located in the ucw-presentations library located at:

http://common-lisp.net/project/ucw/repos/ucw-presentations

darcs-hash:b6d0949cab4ab6930358a98b04234d49a22725b3

The new form library (temporarily called formx) is much much simpler
than the presentation stuff we currently have. This should make it
easer to use and customize, while it may do a lot less it no longer
imposes an entire framevork on every form tag.

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