Resources, dialog messages

[trongdinh]

I have a few recommendations to make for changes in the existing code:

1. use getClass().getClassLoader().getResource wherever possible
because this is the only standard way to get a resource on Java Web
Start

2. use getResourceAsStream wherever possible because this way
resources can be located in jars or whenever else, not just in normal
files.

3. a switch to have the MessageDialog funtions just log the messages
silently.