major usecases handler change + cforms breakage

hi everyone!


i'm about to commit a rather intrusive usecase framework
update.

it will improve the following issues:

* always release flowHelper components in usecase handler
before sendPage
* usecases can now specify not to create a continuation (as
requested by 
doug)
* uri and template views behave consistently (both can
create 
continuations, both can support custom flow (e.g. for
cforms))
* cforms-specific stuff is removed from UsecaseView.java and
replaced 
with a generic method to provide custom flow.
* custom flow can now be changed at run-time and is no
longer a 
build-time thing. [1]

i'd say all of the usecase flow handling is about 3.5 times
nicer than 
before.


however, it will introduce one new bug:

* cforms saving is broken

i have pinpointed the problem to
modules/cforms/flow/customFlow.js, line 
48: var outputStream = source.getOutputStream();
for some reason, this causes a
java.io.FileNotFoundException.

since it is only a side issue and not fundamentally related
to my 
changed, i decided to commit anyway so that people can
review the code.
there is some instrumentation left in the code - perhaps
someone can 
take a look at the issue and suggest a fix?

that said, i don't think cforms should do its document
storing/loading 
in javascript at all (that's why i did not bother to clean
it up much) - 
why don't we just move it into the java usecase code like
all other 
DocumentUsecases do?


it will be perfectly ok with me if someone decides to revert
my changes 
until the remaining issue is solved, in case this bug causes
major 
inconveniences.


hope you will enjoy the new code,

jörn




[1] although updates of custom flow code seem to require a
restart of 
the lenya servlet - i don't know why that is the case, maybe
someone can 
guess? the custom code is loaded via cocoon.load() in
usecases.js.

-- 
Jörn Nettingsmeier

"Hofstadter's Law: It always takes longer than you
expect,
even when you take into account Hofstadter's Law."
	- Douglas R. Hofstadter

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