You can now set the FPS goal with `--fps=10` (or whatever) on the command line;
and the current (measured) FPS is displayed in the lower right corner.
During the run, you can bump the FPS goal up and down with `F` and `f` respectively!
The Slipnet itself turns out to be boring to look at.
More interest is found in the Workspace structures, such as bonds,
groups, and correspondences.
The old behavior of `curses_main.py` is still accessible via
python curses_main.py abc abd xyz --focus-on-slipnet
With the new CursesReporter, I'm able to observe groups getting built
and broken; and I observed that sometimes a Bond (between a Letter and
a Group) would apparently survive the Group's breaking.
Reorder the operations in `breakGroup` so that the higher-level ones
("detach this Group from its external bonds") come strictly before
the lower-level ones ("ungroup this Group's members and remove this
Group from the Workspace, thus destroying it").
However, the "buggy" behavior I observed turned out to be due to a bug
in my display code and not due to anything wrong with `breakGroup`.
I suspect this patch is actually purely cosmetic.
This code is already present in `getPossibleDescriptions`... which is
also a terrible function from the philosophical point of view, because
it secretly encodes knowledge about every predicate known to the system.
