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

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.