Add navigation buttons to related list tables.

Add navigation buttons to related list tables.

* src/main/java/org/glom/web/client/OnlineGlomService.java:
* src/main/java/org/glom/web/client/OnlineGlomServiceAsync.java:
* src/main/java/org/glom/web/server/OnlineGlomServiceImpl.java: Add new
method getSuitableRecordToViewDetails() for getting the table name
and primary key value for related list navigation buttons.
* src/main/java/org/glom/web/client/activity/DetailsActivity.java: Add
private cell renderer class to get the navigation information for
related list tables from the server. Extract the navigation
processing code from the details cell navigation and use it for the
related list navigation as well.
* src/main/java/org/glom/web/client/ui/ListViewImpl.java: Add private
cell renderer class for the details open buttons. This was needed
because the related list navigation buttons and the list view
navigation buttons need to react differently when clicked.
* src/main/java/org/glom/web/client/ui/cell/OpenButtonCell.java: Remove
the onEnterKeyDown() method because it's now overriden in the
subclasses that are specific to the related list tables and the list
view tables.
* src/main/java/org/glom/web/client/ui/details/Portal.java: Increase
the vertical size a little because the buttons add a bit of vertical
space to table. This is not a perfect solution because the vertical
size of with table fewer than 5 rows will be a little smaller.
* src/main/java/org/glom/web/client/ui/list/ListTable.java: Update for
changes in how navigation buttons are handled.
* src/main/java/org/glom/web/server/ConfiguredDocument.java: Implement
getSuitableRecordToViewDetails() using the new RelatedListNavigation
database access object.
* src/main/java/org/glom/web/server/database/DBAccess.java: Move code
to find the portal for a given relationship name from
RelatedListDBAccess. Add method to find a primary key field for a
given table.
* src/main/java/org/glom/web/server/database/RelatedListDBAccess.java:
Move code to find the portal for a given relationship name to
DBAccess.
* src/main/java/org/glom/web/server/database/RelatedListNavigation.java:
New file: database access object for getting the related list
navigation information (the table name and the primary key value).
* src/main/java/org/glom/web/shared/NavigationRecord.java: New file:
DTO for transferring a table name to navigate to and a primary key
value.
* src/main/java/org/glom/web/shared/layout/LayoutItemPortal.java: Add
boolean and getter/setter to specifies if the related list should add
navigation buttons.