restore djgpp, eventually
merge TODO lists
add unit tests for lib/*.c
rewrite du.c not to use explicit recursion

strip: add an option to specify the program used to strip binaries.
  suggestion from Karl Berry

Makefile.maint: extract announcement-generation into a perl script

Add a test of cat that takes input from a tty and ensures
that one ^D is sufficient to make it terminate.  Probably
requires some flavor of expect.