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.

 #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_ */