remove some dead code from BuildStackInfoAdapter

this removes the "main" method and the dependency on the "ClassFormatException".

The "main" method will not work because it uses stuff from "C:/SVN/POLZUG-Solution-1.0-trucking/projects/gui/target/classes".

I could not find any user of the "getStackInfo", so I removed it to get rid of the compiler warning about the "ClassFormatException"