#53 Add alert messages for validated fields to the xml file.

[Bill Cruise]

Currently all validated fields generate the same error message when validation fails. This is really useful from an internationalization standpoint, so I see why it was implemented this way. However, when you have a page full of validated fields (e.g. for setting up a database connection) it would be nice to have a different error message for each field.

My suggestion is to add an attribute for error messages in the antinstall-config.xml file for validated fields so that developers can easily add custom messages. If no attribute is supplied, the current default should be read from the resource file.