Further cleanups (Was: Re: dealing with gjdoc)

Dalibor Topic wrote:
> I'll do the same for tritonus, cp-tools (javap), gnu inet and dnsjava.

Done. Currently, I'm cleaning out the replace directory from no longer 
used code. The next step will be to thin out the jthreads syscall
interface from unused functions, which should let us lose some old 
headers, and further reduce the size of the VM.

cheers,
dalibor topic