Patch: update documentation for gcj-eclipse merge

[Tom Tromey]

>>>>> "Gerald" == Gerald Pfeifer <gerald@pfeifer.com> writes:

>> This patch also documents the various prerequisites, new configure
>> flags, etc.

Gerald> Some quick comments: Why do you remove all references to jacks?

My original note mentioned this but I edited it out :)

Jacks is a test suite for Java language compliance.  Since we've
outsourcing Java parsing and semantic analysis, there's no point in us
running Jacks.  I've removed this code from the libjava test suite.

Gerald> The doc portions of this patch are fine modulo the comments
Gerald> above, as far as I can tell.

I'll fix all these things soon.

Tom