Always render cropper when resizing

but doesn't seems good :/

Reduce the number of pixel managed by caman

Display the capture screen as fast as possible

Like when the browser is offline.

This moves portal_solver_processes from erp5_base to erp5_simulation as its
Portal Type definition is already there and it was initially moved away from
erp5_simulation presumably because erp5_simulation was for new Simulation at
that time.

Also, as delivery_causality_workflow uses portal_solver_processes, move it to
erp5_simulation (along with delivery_causality_interaction). This required
fixing Unit Tests to install erp5_simulation before erp5_trade (it already
depended on it anyway).

When migrating `Immobilisation` Document, imports of not yet migrated
ImmobilisationMovement Document were also replaced...

testUpgradeInstanceWithOldDataFs: Check that all Portal Types classes can be loaded successfully after running upgrader.

testUpgradeInstanceWithOldDataFs: Old Data.fs was created with `--portal_id=erp5`, so it should be passed for erp5testnode too.

ZODB Components: Migration dialog: Only consider Portal Type Document/Tool class and not all its subclasses.

This makes it easier to migrate only Document/Tool classes to the current bt5,
considering that subclasses below are likely to be used in several places.

These conditions were added many years ago and they should not be needed
since checkboxes work without this extra complexity