[kepler-dev] getting-started demo #6 actor

[Sean Riddle]

Is there a specific reason why demo number 6 in getting-started uses  
org.sdm.spa.StringConst instead of a plain String Constant? The only  
difference appears to be the ability to use a file browser widget to  
get a file path, but that doesn't seem useful in this context.

I ask because org.sdm.spa.StringConst doesn't appear to exist as a kar  
file in the library, and therefore there's no centralized location for  
documentation. If a plain String Constant can be used instead, there's  
already documentation written.

- Sean