No permission checks for editing/deleting records with CSV import form

Silverstripe Admin provides a basic management interface for the Silverstripe Framework. In versions on the 1.x branch prior to 1.13.19 and on the 2.x branch prior to 2.1.8, users who don't have edit or delete permissions for records exposed in a ModelAdmin can still edit or delete records using the CSV import form, provided they have create permissions. The likelihood of a user having create permissions but not having edit or delete permissions is low, but it is possible. Note that this doesn't affect any ModelAdmin which has had the import form disabled via the showImportForm public property. Versions 1.13.19 and 2.1.8 contain a patch for the issue. Those who have a custom implementation of BulkLoader should update their implementations to respect permissions when the return value of getCheckPermissions() is true. Those who use any BulkLoader in their own project logic, or maintain a module which uses it, should consider passing true to setCheckPermissions() if the data is provided by users.