Since the unit test is skipped anyway for Oracle, the dropTable() call
should be skipped as well to avoid having a leftover transaction and
cause further transactions to be nested and break the next test suites
requiring transactions.
adding auto increment/PK to table files_trash
adding PK to table ldap_user_mapping and ldap_group_members
adding PK to table ldap_group_mapping
truncate permissions table to allow smooth creation of primary key
adding unit test for creating an auto increment column on a table which already contains data
remove unneeded table files_trashsizes
fix unit test
no need to truncate *PREFIX*permissions
On Oracle adding auto increment columns is not working out of the box - Oracle migrations are to be done manually
