state_permission_roles attributes should be updated when the permission list is changed on the workflow
it also fix matrixbox edition (was crashing when permissions where added)

+ remove unused dependencies

instead of re-coding the wheel

because they are related to the cells

remove custom methods or rename them to start with _ not to be confused with API methods
+ add first prototype of mixinCustomStorageMatrixMixin

data structure state_permission_roles

this avoid to create a big amount of objects for each state of each workflow

when converting workflow

move "view_graph" view from erp5_workflow bt5 to erp5_graph_editor

after calling this script, positions of the states will be chosen by jsplumb
and manually saved positions will be erased

+ separate python script from XML

to ERP5 Workflow and use them

they are used in Interactions
+ improve categories TALES

instead of getXXXScriptIdList, which calls getXXXScriptValueList anyway (-> bad performances)

instead of using self.publish()

it was the same as PythonScript property sheet

guard expression is now an Expression object, so it is required to
display its 'text' attribute

it was 'TypeError: cannot concatenate str and NoneType objects'

and modify checkGuard to have expected behaviour

this fixes error when accessing to special views on Transition objects
it also remove duplication of guard properties (they were stored in the
properties of the guarded object *and* in a guard object)