Add field colouring to details view.

Add field colouring to details view.

This change re-works how field colouring works. The colour formatting
information is now set to the client with the layout information instead of
with the data. This eliminates the need to send the same colour strings for
data in list view column when colour information is set.

In order to set an alternate colour for negative numeric values, the
number is now sent to client and formatted with the GWT NumberFormat class.

This change also fixes:

https://bugzilla.gnome.org/show_bug.cgi?id=659752

* src/main/java/org/glom/web/OnlineGlom.gwt.xml: Add the GWT
internationalization framework which is needed for client side numeric
formatting.
* src/main/java/org/glom/web/client/Utils.java: New file for some
client static utility methods.
* src/main/java/org/glom/web/client/activity/DetailsActivity.java: Pass
the DataItem object to the Field class. Use a utility method to
create the foreignKeyValue string.
* src/main/java/org/glom/web/client/ui/details/Field.java: Set
alignment and text colours in the constructor. Add setData(DataItem)
method. Remove setText(String) method.
* src/main/java/org/glom/web/client/ui/list/ListTable.java: Add the
colour information to GlomTextCell. Create and use GlomNumberCell for
rendering numbers. Use utility method to get the string for the
primary key of the key provider. Re-work how the horizontal alignment
is set.
* src/main/java/org/glom/web/server/ConfiguredDocument.java: Add
formatting to layout information. Methods for converting the libglom
formatting information were moved from DBAccess.
* src/main/java/org/glom/web/server/database/DBAccess.java: Remove
numeric formatting (it's now done on the client side). Don't set text
colours in DataItem. Move libglom formatting conversion methods to
ConfiguredDocument.
* src/main/java/org/glom/web/shared/DataItem.java: Remove fields and
getters/setters for text colour information.
* src/main/java/org/glom/web/shared/GlomNumericFormat.java: New file
for transferring the libglom NumericFormat information to the client.
* src/main/java/org/glom/web/shared/layout/Formatting.java: Add fields
and getters/setters for: GlomNumericFormat, background colour and
foreground colour strings.