Using http_texture_load as the test subject, library looks clean.  Did
some better shutdown in the program itself and it looks better.  Libcurl
itself is making a lot of noise.  Adapted testrunner to run valgrind as
well but the memory allocation tester in the tools themselves grossly
interferes with Valgrind operations.

Well, achieved that by doing work in bulk when needed.  But
turned into some additional things.  Change timebase from
mS to uS as, well, things are headed that way.  Implement
an HttpReplyQueue::fetchAll method (advertised one, hadn't
implemented it).

Beefed up the metrics gathering in http_texture_load to get memory sizes and
cpu consumption on windows (still need to implement that on Mac & linux).
Ran runs with various idle loops with sleeps from 20 ms down to pure spinning,
varied Block allocation size from 1504 to 2^20 bytes.  2ms/2ms/65540 appears
to be a good spot under the test conditions (Win7, danu grid, client in Boston).

This is a command-line utility to pull content down from a service through
the llcorehttp library to produce timings and resource footprints.