TODO: Implement more testing

Added fd_comments permission; refactored backend test_perms; removed unimplemented old-style process options, that will be implemented in new-style processes

(although the future might easily disprove me)

permissions talk of statements instead of agreements, and one can edit them even when having an ldap record

Refactored test_person_permissions to use the new faster backend.unittest, and include process permissions

Introduced permission systems for see_agreements and edit_agreements, and started refactoring permissions tests