Need <sys/types.h> -- for MinGW?

Handle -seconds and -frames correctly -- thanks to g++ -Wall for catching
improper ref to ws->...!

It contains only internal .h references -- not to system headers nor Syzygy ones.

will be part of this.  Prepare to package multiple commands together
so we can ship several in one display cycle.

though not to process any commands after command-line startup yet.

(Why does it need to complain about losing precision on a reinterpret_cast??)

Add Ident and Log entries.

Interpret threshholding correctly for "hist".
Make "thresh off" finally work again, too.  Good grief.

Let's try using fdopen() and feed it a FILE * instead.
This also avoids trouble with the g++ 3.x -> 4.x interface change for
the 'int fd' constructor.

Make kira_open read plain files again.

Don't discard texture data after loading it into opengl.
If the window gets recreated (detached, quadbuffer-mode-switched, etc.),
we'll need it again.

XXX Or, should we just re-read the image files if the occasion arises?

or when it changes quadbuffered-stereo status.