+1.1.0:
+ change to one-big-makefile (cf. "Recursive Make Considered
+ Harmful"). Update documentation (esp. "HOW-TO-CONTRIBUTE" to
+ reflect that.
+
+1.0.0:
+ rearrange directory structure to cut down on clutter
+ (first insure that every .c and .h file has the correct
+ license notice)
+
0.9.9:
add explicit license information to each .c and .h file.
move (almost all) #includes into common.h