Various cloner fixes (#841) (#881)

* Various cloner fixes.

+ If you are admin, and in the Network or Root Site dashboard, clicking, clone a book shows"Forbidden"
+ Add animated progress bar while waiting.
+ Fix animated progress bar in Safari. (Apparently some Safari users haven't seen this bar in a while?)
+ Add option to turn off Cloning like we do the Root API.

* Add tests

* Remove leftover comments [ci skip]

* Tabs, not spaces. [ci skip]

* Increase code coverage.

* Fix animation for Safari?

* Spelling mistake, exporting should be cloning [ci skip]

* Fix animations in Safari, sort of.

assets/dist/mix-manifest.json

@@ -1,7 +1,8 @@
 {
-    "/scripts/anchor.js": "/scripts/anchor.js?id=5c7c725b52375b03aa17",
+    "/scripts/anchor.js": "/scripts/anchor.js?id=93dbf0faa543061de453",
     "/styles/catalog.css": "/styles/catalog.css?id=b79007e4618c2f3deb07",
     "/styles/colors-pb.css": "/styles/colors-pb.css?id=7a8e1e7655cc0d56a0c0",
+    "/styles/cloner.css": "/styles/cloner.css?id=2d45920e06cfcdc16ae9",
     "/styles/custom-css.css": "/styles/custom-css.css?id=6bbe722767d0bba3e29b",
     "/styles/export.css": "/styles/export.css?id=00b43962d0551c330a62",
     "/styles/metadata.css": "/styles/metadata.css?id=0f07ef0ed371a8cd93c5",
@@ -13,19 +14,20 @@
     "/styles/select2.css": "/styles/select2.css?id=7373e0d2a1e8dabab523",
     "/styles/style-catalog.css": "/styles/style-catalog.css?id=3d6b6de8061e7bca0891",
     "/styles/theme-options.css": "/styles/theme-options.css?id=fd34b45cc4d49cbd68c4",
-    "/scripts/organize.js": "/scripts/organize.js?id=53a97c69187216c8a6ac",
-    "/scripts/export.js": "/scripts/export.js?id=99be4f2aad1fbe0f193e",
-    "/scripts/theme-options.js": "/scripts/theme-options.js?id=d97fac00cf6e3d923512",
-    "/scripts/theme-lock.js": "/scripts/theme-lock.js?id=3d4a94d65eb2ab4aa576",
-    "/scripts/textboxes.js": "/scripts/textboxes.js?id=0156851b6bbe29490415",
-    "/scripts/small-menu.js": "/scripts/small-menu.js?id=700b771625ddd76cf39f",
-    "/scripts/search-and-replace.js": "/scripts/search-and-replace.js?id=542b2947e2d96422f564",
-    "/scripts/quicktags.js": "/scripts/quicktags.js?id=48eca66663c5534febd1",
-    "/scripts/network-managers.js": "/scripts/network-managers.js?id=d178711e845e48bf72c2",
-    "/scripts/import.js": "/scripts/import.js?id=57bcdade89eb1c1d7acc",
-    "/scripts/ftnref-convert.js": "/scripts/ftnref-convert.js?id=95251a52bc07d6cc330c",
-    "/scripts/footnote.js": "/scripts/footnote.js?id=f05284f931aff0f42753",
-    "/scripts/color-picker.js": "/scripts/color-picker.js?id=b7dd754d96756374cc44",
+    "/scripts/organize.js": "/scripts/organize.js?id=1ff8492ff5d664f154dc",
+    "/scripts/export.js": "/scripts/export.js?id=b74f236725e41667cf82",
+    "/scripts/theme-options.js": "/scripts/theme-options.js?id=2a788052416d545822d6",
+    "/scripts/theme-lock.js": "/scripts/theme-lock.js?id=1d7c9863aa73fc03187a",
+    "/scripts/textboxes.js": "/scripts/textboxes.js?id=d430be46e5c2013372c8",
+    "/scripts/small-menu.js": "/scripts/small-menu.js?id=f4b3cbd9ece90e7c194e",
+    "/scripts/search-and-replace.js": "/scripts/search-and-replace.js?id=5b92c041bb7da8f87951",
+    "/scripts/quicktags.js": "/scripts/quicktags.js?id=18e128e04a9a234e6bc0",
+    "/scripts/network-managers.js": "/scripts/network-managers.js?id=65a4afdd7f0d90595276",
+    "/scripts/import.js": "/scripts/import.js?id=6b108d829bd573769284",
+    "/scripts/ftnref-convert.js": "/scripts/ftnref-convert.js?id=ca2753a841bad47c1382",
+    "/scripts/footnote.js": "/scripts/footnote.js?id=829062d26969e0713955",
+    "/scripts/color-picker.js": "/scripts/color-picker.js?id=c2360b2748dbefca4dfb",
+    "/scripts/cloner.js": "/scripts/cloner.js?id=2288521093f2f51b11a7",
     "/scripts/catalog.js": "/scripts/catalog.js?id=dde599eb38ca92f4f5f8",
     "/scripts/book-information.js": "/scripts/book-information.js?id=3e4518893b6f6db765e4",
     "/scripts/applyclass.js": "/scripts/applyclass.js?id=720602589bf240bc79a8",