Add some tasks to the to do list.

README.md

@@ -51,6 +51,9 @@ If you are interested in helping, please raise an issue before making any pull r
 - Improve the appearance of album page. Too many section headers and the "Create album" interface should allow giving a title immediately.
 - When users have '%' or '#', etc. in their username, it is difficult to access their /user/ URL. I would prefer to fix it without simply blacklisting those characters.
 - Currently, the Jinja templates are having a tangling influence on the backend objects, because Jinja cannot import my other modules like bytestring, but it can access the methods of the objects I pass into the template. As a result, the objects have excess helper methods. Consider making them into Jinja filters instead. Which is also kind of ugly but will move that pollution out of the backend at least.
+- Use browser localstorage to act as a clipboard for holding photos, so that you can select them on one tab and move them into an album on another, etc.
+- Perhaps instead of actually deleting objects, they should just have a `deleted` flag, to make easy restoration possible. Also consider regrouping the children of restored Groupables if those children haven't already been reassigned somewhere else.
+- Add a new table to store permanent history of add/remove of tags on photos, so that accidents or trolling can be reversed.
 
 ### To do list: User permissions
 Here are some thoughts about the kinds of features that need to exist within the permission system. I don't know how I'll actually manage it just yet. Possibly a `permissions` table in the database with `user_id | permission` where `permission` is some reliably-formatted string.