Put dtfj, dtfjview & traceformat code back into tools.jar

[pshipton]

#65 moved the dtfj, dtfjview & traceformat code out of tools.jar and into individual jar files which are added into the lib/ext directory.

I'm not convinced this is the correct way to go. Although having the jars in the ext directory is how it works for IBM Java 8, its not the correct way to do things. Putting these jars in the ext directory incurs some costs. Both in the disk size of a JRE (which shouldn't contain these development tools), and also in class loading performance at runtime. Any class lookup based on the system classloader will be a little slower because of these additional jar files are in the ext directory.

The code should be put back into tools.jar. jdmpview and anything else required should be modified to find it there.