- document 2 memory leaks, one in cache and one in tcache
- test coverage for the patch Brian applied in Dec 2000

- replace nasty and ineffective hack for dynamic connections ids in ZSQL Method cache which is tested and works
- simplify tests as a result
- make sure full chain of DA.__call__ and DA._cached_result is execercised

The tests pass but XXX marks stuff that needs fixing.

        HTTP header will be done only for 'text/*'

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Call setDefaultSkin on new requests created as the result of ConflictError retries.  This allows view lookups to continue to work during retry attempts.

Fixed functional.http to only pass the request body (no headers) to
publish_module. Thanks to Andreas Zeidler.

Fixes http://www.zope.org/Collectors/Zope/2178

Help avoid acquisition disaster in Folder.manage_main (main.dtml).