Allow pre conversion to happen on any ERP5 Web Page's content  which include relative images (through <img> tags).

    - 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 'activate().expand()' by
  'expand(expand_policy="deferred")'.
expand() still accepts activity parameters for any extra needs.

In causality workflow, 'building' state is clarified and now means
« delivery may diverge but we can't know now ». A delivery remains in draft
as long as it does not contain any movement built from simulation.
After init/clone/builder/etc. scripts used to call 'startBuilding' &
'updateCausalityState': this calls must be removed since only
SimulatedDeliveryBuilder should take care of move to 'building' state and
workflows now triggers 'updateCausalityState'.

Disguised interactions have been unhardcoded and either deleted, or moved to
appropriate interaction workflows, which have been reorganized. Those
that triggers update of portal_workflow can be easily customized or disabled.

New API:
- updateSimulation() on deliveries and subscription items. It takes care of
  creating root applied rule, expanding and reindexing parts of simulation
  trees. It somehow replaces:
  - Delivery_updateSimulation
  - Delivery_updateAppliedRule
  - Delivery.applyToDeliveryRelatedMovement
  - Delivery.updateAppliedRule
  - Delivery.expand
  - Delivery.expandRuleRelatedToMovement
  - SubscriptionItem.expand
  - SubscriptionItem.updateAppliedRule
- Delivery.localBuild() is the new way to do local building and replaces
  Delivery_expandAndBuild. Private method Delivery._localBuild replaces
  Delivery_buildOnComposedDocument.
- Simulation Movements that are being built by a builder are reindexed with
  the following tag: 'built:<delivery_path>'. Any after_path_and_method_id
  dependency against 'related_simulation_movement_path_list' and reindexing
  methods should be replaced by this after_tag.

After builder scripts used to confirm the delivery in a separate activity,
which was useless.

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.