Restructuring experiments repo to combine single_host and pronghorn
experiments togehter.  First step is to move single_host down a
directory.
Upating single_host to produce a jar instead of just running directly from ant.
Moving previous experiments directory into root experiments directory
and updating buildfile and experiments to reflect changes (eg.,
several classes' moving from single_host package to pronghorn
package).  Currently, experiments do not build because they presuppose
using old instance.rph interface.  Next commits will fix that by
instead installing separate programs for each test and using those.
Refactored all previous experiments to use applications instead of
presupposing that interfaces were installed on underlying controller
itself.  There are a few tests that will not work (multicontrollers),
and have added fixmes and asserts for them.  Must fix.