Support for less/equal/greater version in requires/conflicts, etc

Add less/equal/greater information to razor_property, and update
importers and other code.

Move the rpm importer from import.c to rpm.c to avoid code
duplication, and then rename import.c to yum.c since that's all that's
left.

#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_ */