Timer.c contains the source for some delta time manipulation routines.
These routines allow you to schedule the execution of a routine at
some point in the future.  ttest.c is a test routine to demonstrate
some of the uses of the routines.  Compile it using the command,
make install, and then run it using the command, ttest.  The results
should be

$ make install
 	cc -O -c timer.c
	cc -O -c ttest.c
	cc timer.o ttest.o   \
	    -o xttest
	cp xttest ./ttest
$ ttest
1
*2
3
5
6
*6
8
*10
*12
**15
*16
**18
**24

The numbers represent elapsed time in seconds since the command, ttest,
was issued.

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