workqueue example, still tweaking

Hey all,

I'm still working on the workqueue (haha), and am pretty darned close.
I've attached my work-in-progress so you can see the pattern (and
offer early feedback if you'd like!).

This patch still fails:
FAIL: basic_tests.py 12: basic revert command
FAIL: copy_tests.py 24: wc to wc copy with deleted=true items
FAIL: merge_tests.py 40: conflict markers should match the file's eol style
FAIL: update_tests.py 27: conflict markers should match the file's eol style

So I'll be digging into that tomorrow, trying to iron out the final
edges. Then commit, then work on cleaning up from that "known good"
spot.

I'll note that the run_revert() function here is pretty large, but
that over time it will diminish. The workqueue operations are all
about managing *files*. When we move properties into the database, and
add some sanity to the pristine datastore, then I think functions like
this will shrink dramatically. In addition, there is a lot of code
that does the revert using the old entry_t model, but the bulk of
*that* should move into svn_wc__db_op_revert().

Again, your thoughts are welcome, or simply wait for the commit :-)

Cheers,
-g

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