#58 Improve visualization of try-catch blocks

[Sami Koivu]

Currently (version 0.7) reJ shows try-catch blocks as labels in the source code. Finally blocks are even more obscure as they are a try-catch block with no exception defined.

Study how to visualize the try-catch-finally constructs in a better way, keeping in mind that the classfile may have try-catch blocks that are incompatible with the try-catch blocks are defined in a Java source file.