Update manual with subsection for WPI results

[jyoo980]

There are still some WPI-generated logs that I do not have an explanation for, such as:

• dljc.cache - I assume this is just a cache for a do-like-javac invocation, not sure it warrants mentioning in the manual.
• jars.json - Not sure what this is, seems to be empty for most projects.
• dljc-stdout-*-*-* - some type of output file produced by do-like-javac.

[kelloggm]

dljc.cache - I assume this is just a cache for a do-like-javac invocation, not sure it warrants mentioning in the manual.

I agree.

jars.json - Not sure what this is, seems to be empty for most projects.

I'm also not sure. I've never used it for debugging WPI, so I think we can avoid mentioning it (or mention that it should usually be ignored).

dljc-stdout---* - some type of output file produced by do-like-javac.

These files are sometimes useful, if the problem you're debugging is in DLJC itself: these are its stdout. Sometimes it prints error messages here.