__getattr__ was overriden in order to be able to call the script
using its reference (not prefixed by script_) from another workflow
script (see testTradeReports for example)

the problem is that it was doing a lot of useless getattr (each time,
it was checking for script_foo, even if foo is a transition, state, ...)

we now just change the context given to the script by adding foo
for script_foo to the context dict

It should not be useful with the new WorkflowTool.

by redefining getSourceValue (workflow) and getDestinationValue (transition)

creating a guard when all the informations are already in properties
of the object is useless, these guards were forgotten

in testERP5Workflow, a test was failing due to changes in
storage of expressions (we now store the expression object
so we don't have to recompile the expression all the time)

the only way to escape the 'while 1' loop was depending on changes on the state
variable, which was, before this fix, using the invariant tdef instead of
transition

a few useless methods

in order to remove hardcoded 'transition_' or 'script_'

this file has already been moved to erp5_core

with old DCWorkflow, portal_workflow could contain the chain_dict for portal_type/workflow
association

this is a wrapper for the PythonScript __call__ method
It should fix testSecurity

This fixes testListboxToolBarDelete failure in testFunctionalKM

keep it as compatibility code but also search for new workflow/portal_type association
directly in portal_type (type_workflow_list)
This fixes some failures in testFunctionalCore