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    - This permit we reuse it everywhere.

 - Arbitrary remove objects and delete workflow history is bad. This code
  was never used anyway.
 - Clean up code which is not used anywhere anymore, legacy from long ago
  implementation.

This reverts commit 20f05949.

While having good naming conventions is good, it's a task to
make it passing. Since it shows no important regression, this
should be commited when this test pass (or it can be enabled first
on only one or two bt, and then on more and more)

Use permanent URL where possible.

In products/ERP5/Document/BusinessTemplate.py, when trying to build
an item, an error occured because item was set to None by clean method.

it can be desired (and reflected in test) that developer needs no selections.

Use nice URLs to access from RSS Discussion Post.

Add web alike getDescription (WIP)

extend code to pass firefox and xvfb binaries as parameter to runUnitTest. With this, is possible run functional tests using firefox and xvfb binaries from selenium testrunner

Refactor code to request installation and instanciation of external profiles passed on parameter dict

add workaround for Internet Explorer's bug to download files over SSL. More details here: http://support.microsoft.com/kb/316431

- splitted expand, performance improvements and bugfixes
  (see commit 5c09e2e2 for more information)
- Zope: monkey-patch 'transaction' to provide start time of transaction
- CMFActivity: new 'merge_parent=<path>' SQLDict parameter
- CMFActivity: try to reserve older messages first (ORDER BY priority, date)
  (see commit 275799fe to update existing
   activity tables)
- drop legacy simulation

All interactions and activity tags are reviewed to fix bugs like duplicated
root applied rules, and also reduces the amount of duplicated/useless work, e.g:
- Simulation trees are not expanded anymore when simulated objects are modified.
- 'expand' activities are merged (i.e. dropped) with any other 'expand' activity
  for an ancestor.
New implementation exposes new API that hides much complexity to the developper
about activity dependencies.

By default, expand() now automatically defers any work if the current
transaction takes too long time. This method also gains a parameter to
explicitely choose when to expand, which is often important in unit tests or
solvers. In particular, when postponing work, it takes care of setting proper
activity dependencies.
- If you have any code requiring to expand everything immediately, you'll have
  to replace 'expand()' by 'expand(expand_policy="immediate")'.
- On the contrary, you should replace any '...

Base on work by Mame Coumba Sall <mame@nexedi.com>

If specified, <path> must be the path of an ancestor and SQLDict will merge all
similar messages under this path and process only the root message.

This will be used in ERP5 simulation to drop 'expand' activities that are
children of other 'expand' activities.

Because it can be used with grouped messages, it may be interesting to used it
for recursiveImmediateReindexObject.

This reverts commit 2a84df59 partially.
With a good index, requests should be fast enough to avoid locks.

Use following requests to update activity tables:

ALTER TABLE message DROP KEY processing_node_date, ADD KEY processing_node_priority_date (processing_node, priority, date);
ALTER TABLE message_queue DROP KEY processing_node_date, ADD KEY processing_node_priority_date (processing_node, priority, date);