redo some of the transaction code, get conflicts and obsoletes partly working

now uses a bit array of to-be-installed/removed packages and uses that to
avoid needing to do either per-property searches or repeated merges. but it
really needs to have a bit array of properties too probably

checkpoint before starting on simplifying/cleaning up the existing
transaction code

 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