Workflow.py: modify object getter since the id of object has added suffix; add property Reference and variable _isAWorkflow.

InteractionWorkflow.py: add property Reference and varable default _reference, add _isAWorkflow for compatibility.

WorkflowState.py: modify workflow getter since workflow_module has been merged with portal_workflow.

ERP5WorkflowTool.py: chang the inherance parent class order, reload the original  dtml, reload the original getWorkflowIds, reload the original all_meta_types.

erp5_core: Add erp5_workflow to dependencies and test dependencies since new workflow tool has been deployed.

This is still a work in progress

Until now, it was only possible to define the ID on properties, then the
reference was guessed from the ID. We even had constraint to make sure
when we define a standard "foo" property that the ID was "foo_property".
Then the reference "foo" was guessed for the ID.

This is not user friendly, it is more logical to make the ID non editable
and guess it from the reference. Therefore now the developer could define
the reference, like "foo", and the corresponding ID will be automatically
set.

- run computation before trying to get results
- always defined a section, it is mandatory in UI so it should be in tests

A zindex of -1 breaks handsontable.

This reverts commit 514a5157.

This is very convenient when we use portal_templates.upgradeSite to
make sure some bt will always be installed with force=1. This is
usually used when we have a bt patching other bt.