a single timestep ourselves!

New modules async.c and nethack.c.

Add draw-tracing hook.
Fix typo in un-ifdef'd code.

Add pointsize metering, normally #ifdef USE_PTRACK'ed out.

Fix tokenize() for case of "quoted" or 'quoted' arg strings.

Let @CFLAGS@ tell us where X include-files are.

simply enable lighting and use it later, currently in specks_draw_mesh().

to interact with double-buffering.
Use preload_pdyn() to precompute trees for each worldbundle.

don't overwrite args in memory.

mouse samples.  (Actually don't believe delta-t smaller than .15 sec.)

inside #ifdef brackets.

all those maintained by specks_timespecksptr.  We no longer guarantee
that st->curtime is always in range 0..st->ntimes-1, so just yield NULL
for out-of-range references.  New CURDATATIME(fieldname) does it.

Only call parti_parse_args() if non-CAVE.

"spi fast" -> SPI_PF_AUTO.

toggle-button colors to change.  Lets us (barely) see when
inertia and hrdiagram toggles are selected.

Add new per-particle field, "ismember", to show escapees.

"inertia on/off" and "detach [fullscreen]" commands.

Adds a series of "spi XXX" commands.

in detached mode.

and let postdraw return an int.  Keep looping, re-rendering,
until postdraw returns zero.