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.

 .gitignore

 *.o

 *~

 *.repo

 razor

 pkgs

 set

 primary.xml.gz