Set title of Portals in the Details View.

Set title of Portals in the Details View.

* pom.xml: Bump required version of java-libglom to 1.17.1.
* src/main/java/org/glom/web/client/ui/details/Group.java: Move Portal
widget creation to its own class. Add comments to constructor.
* src/main/java/org/glom/web/client/ui/details/Portal.java: New file.
The code is mostly from the Group class with the title now set.
* src/main/java/org/glom/web/server/OnlineGlomServiceImpl.java: Set
title of Portal. Update some comments. Fix some code formatting.