*** empty log message ***
rcheck works.
use digest pacakge to summarize data structures, and use *that* to
make sure we produce working code (for *one* side of read.image(),
anyway).
stop annoying message from pixmap().
using getopt package for command parsing.

(major defect: getopt can't deal with positional parameters.)
./rtests.R ==> ./tests/rmd5image.R
s/rimage2k/image2k/g
re-instate R/image2k.R.in.
get pref.lib working.