The batch query call used by Condor (query_batch_set(), in the C++ API)
returned info about all the jobs in the set of batches,
even those that hadn't changed.
This is potentially inefficient - a query might return info
about 10,000 jobs, only a few (or none) of which have changed state
since the last call.

Solution: add a "min_mod_time" parameter to the call.
Only jobs that have changed state since that time are reported.
Also, add a "server_time" field to the return,
giving the current time on the server
(in case there's clock skew between client and server)

Also, fix some text scrambling introduced in previous checkin;
there must have been a gremlin in my vim.