Redo updates and removes in terms of a single razor_transaction abstraction

Also does versioned depsolving at least partially.
Update main.c and test-driver.c for that, and fix some unrelated test-driver
bugs.

Now gets up to testUpdateSinglePackageObsoletesOldRequirement, although
it really should not be passing the multilib tests; apparently they aren't
clever enough in their testing of the depsolving algorithm and are allowing
it to come up with the right answer for the wrong reason.

 CFLAGS = -Wall -Wstrict-prototypes -Wmissing-prototypes -g

 LDLIBS = -lexpat -lz -g -lrpm -lcurl

 all : razor test-driver

 razor : razor.o yum.o main.o rpm.o types.o util.o

 *.o : razor.h razor-internal.h

 razor.o : types.h

 test-driver : razor.o types.o util.o test-driver.o

 test : test-driver

 	./test-driver test.xml

 clean :

 	rm -f *.o razor