avrprog.c:
Add lots of comments, move getop() variable declarations to
the top of the program.
Add a typedef name to the AVR memory type and use it for
function declarations.
Add a usleep() delay in the sense loop to avoid becoming a cpu
hog.
Print out a version string so that folks know what version of
the software they are running.
Be sure and close the parallel device and the i/o file when
terminating abnormally.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@8 81a1dc3b-b13d-400b-aceb-764788c761c2