Don't parse Tracer as an aspect

[Jesper Öqvist]

Currently JastAdd parses the Tracer class as an aspect file and apparently the Filter interface gets generated in a separate file despite that it is an inner interface in the Tracer class.

The Tracer class should just be written directly to Tracer.java.

[Jesper Öqvist]

Write the Tracer class directly to file

• write Tracer class directly to Tracer.java
• don't parse the Tracer class as an aspect
• don't generate Tracer without --tracing option

fixes issue #144 (bitbucket) fixes issue #145 (bitbucket)

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