Smarter access logic for reports' experiments

This MR takes advantage of the experiment.accessibility_for(user) method on the server to generate an access map to properly check which experiments the user has access to, and which they don't. Depending on the access map, the reports app will show either the full experiment name and give the corresponding URL, or give just the alias and no URL.

Closes #525

beat/web/reports/static/reports/app/directives/panelExperiments.js

@@ -138,7 +138,10 @@ angular.module('reportApp').directive("groupPanelExperiments", ['GroupsService',
                     </td>
                     <td ng-if='!isViewmode()'><input ng-model='group.aliases[expName]' ng-model-options="{ debounce: 500 }"></input></td>
                     <td ng-if='isViewmode()'><span>{{ group.aliases[expName] }}</span></td>
-                    <td><a ng-if='accessMap[expName]' href='{{ getExpUrl(expName) }}'>{{ getExpName(expName) }}</a></td>
+		    <td>
+			<a ng-if='accessMap[expName]' href='{{ getExpUrl(expName) }}'>{{ getExpName(expName) }}</a>
+			<i ng-if='!accessMap[expName]'><small>experiment not accessible for current user</small></i>
+		    </td>
                     <td>
                         <span ng-repeat='db in getExpDatabases(expName)'>
                             <a href='{{ getDatabaseUrl(db.split("@")[0]) }}'>{{ db }}</a>