update to deal with obsoletes better

when looking for a package "foo" to install/update, we have to look
not just for a package named "foo", but also any package that
obsoletes+provides "foo".

So redo the algorithm to satisfy *all* installs/removes from the
property list, so now we don't need to walk the package list at all.

 #ifndef _RAZOR_INTERNAL_H_

 #define _RAZOR_INTERNAL_H_

 #define ALIGN(value, base) (((value) + (base - 1)) & ~((base) - 1))

 /* Utility functions */

 int razor_create_dir(const char *root, const char *path);

 int razor_write(int fd, const void *data, size_t size);

 #endif /* _RAZOR_INTERNAL_H_ */