Change people.remove() to people.deactivate() and fix bug.

This commit changes people.remove() to be people.deactivate(),
and it fixes a bug where deactivating users was causing tracebacks
in the PM list if somebody had PM'ed the deactivated user
recently.

frontend_tests/node_tests/dispatch.js

@@ -583,7 +583,7 @@ run(function (override, capture, args) {
     assert_same(args.person, event.person);
 
     event = event_fixtures.realm_user__remove;
-    override('people', 'remove', capture(['person']));
+    override('people', 'deactivate', capture(['person']));
     dispatch(event);
     assert_same(args.person, event.person);
 

frontend_tests/node_tests/people.js

@@ -77,11 +77,15 @@ var _ = global._;
     people.update({email: email, full_name: 'The Godfather of Calculus'});
     assert.equal(global.page_params.fullname, 'The Godfather of Calculus');
 
-    // Now remove isaac
-    people.remove(isaac);
-    person = people.get_by_email(email);
+    // Now deactivate isaac
+    people.deactivate(isaac);
+    person = people.realm_get(email);
     assert(!person);
 
+    // We can still get their info for non-realm needs.
+    person = people.get_by_email(email);
+    assert.equal(person.email, email);
+
     // The original person should still be there
     person = people.get_by_email('orig@example.com');
     assert.equal(person.full_name, 'Original');
@@ -113,13 +117,14 @@ var _ = global._;
     person = people.get_person_from_user_id(42);
     assert.equal(person.full_name, 'Mary New');
 
-    // remove() should eventually just take a user_id, but
-    // now it takes a full person object
-    people.remove(person);
-    person = people.get_by_email('mary@example.com');
+    // deactivate() should eventually just take a user_id, but
+    // now it takes a full person object.  Note that deactivate()
+    // won't actually make the user disappear completely.
+    people.deactivate(person);
+    person = people.realm_get('mary@example.com');
     assert.equal(person, undefined);
     person = people.get_person_from_user_id(42);
-    assert.equal(person, undefined);
+    assert.equal(person.user_id, 42);
 }());
 
 (function test_get_rest_of_realm() {

static/js/people.js

@@ -226,10 +226,10 @@ exports.add_in_realm = function add_in_realm(person) {
     exports.add(person);
 };
 
-exports.remove = function remove(person) {
-    people_dict.del(person.email);
-    people_by_user_id_dict.del(person.user_id);
-    people_by_name_dict.del(person.full_name);
+exports.deactivate = function (person) {
+    // We don't fully remove a person from all of our data
+    // structures, because deactivated users can be part
+    // of somebody's PM list.
     realm_people_dict.del(person.email);
 };
 

static/js/server_events.js

@@ -101,7 +101,7 @@ function dispatch_normal_event(event) {
         if (event.op === 'add') {
             people.add_in_realm(event.person);
         } else if (event.op === 'remove') {
-            people.remove(event.person);
+            people.deactivate(event.person);
         } else if (event.op === 'update') {
             people.update(event.person);
             admin.update_user_full_name(event.person.email, event.person.full_name);