Added chmod perm, modal to change, api with local/ftp/sftp (#399)

Read a fill current permissions for local driver

Finished permissions for ftp driver, read and change

Read permissions for sftp adapter

Created FilegatorFtp for a cleaner permissions integration

Implemented recursive chmod options for files/folders

Modified tests to cover permissions

Lint frontend permissions component

frontend/views/partials/UserEdit.vue

@@ -56,6 +56,9 @@
             <b-checkbox v-model="permissions.zip">
               {{ lang('Zip') }}
             </b-checkbox>
+            <b-checkbox v-model="permissions.chmod">
+              {{ lang('Chmod') }}
+            </b-checkbox>
           </div>
         </b-field>
       </form>
@@ -96,6 +99,7 @@ export default {
         download: _.find(this.user.permissions, p => p == 'download') ? true : false,
         batchdownload: _.find(this.user.permissions, p => p == 'batchdownload') ? true : false,
         zip: _.find(this.user.permissions, p => p == 'zip') ? true : false,
+        chmod: _.find(this.user.permissions, p => p == 'chmod') ? true : false,
       }
     }
   },
@@ -107,6 +111,7 @@ export default {
         this.permissions.write = false
         this.permissions.batchdownload = false
         this.permissions.zip = false
+        this.permissions.chmod = false
       }
     },
     'permissions.write' (val) {
@@ -114,6 +119,7 @@ export default {
         this.permissions.read = true
       } else {
         this.permissions.zip = false
+        this.permissions.chmod = false
       }
     },
     'permissions.download' (val) {
@@ -133,6 +139,12 @@ export default {
         this.permissions.write = true
       }
     },
+    'permissions.chmod' (val) {
+      if (val) {
+        this.permissions.read = true
+        this.permissions.write = true
+      }
+    },
   },
   methods: {
     selectDir() {