ZODB Components: erp5_simulation: Migrate Solvers and Testers from filesystem.

@nexedi This also migrates Solver Process Tool. portal_solver_processes was initially in erp5_simulation but was moved by @kazuhiko a while ago to erp5_base while its Portal Types is still in erp5_simulation (the commit message is not useful at all but this is another matter already raised by @jm recently):

commit 89140a6ef37e7f35ff3843574912b1bce606bed5
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Tue Jun 29 10:56:19 2010 +0000

    * Move portal_solvers and portal_solver_processes from the experimental erp5_simulation business template to the erp5_base business template.

However, if we put it in erp5_base, it means that Solver Process, Solver Decision and so on should also be moved to erp5_base while I think it should be in erp5_simulation...

Furthermore, this triggers a warning when erp5_simulation is not installed:

WARNING ERP5Type.dynamic Cannot find a portal type definition for 'Solver Process Tool', trying to guess...