improve the list abstraction with "struct list_head" and "struct list"

both structs are actually just uint32_t's in disguise, using bitfields
to avoid the need for explicit bit operations, and using two type names
to hide the RAZOR_IMMEDIATE hack from the public API

Add a list abstraction for package/property lists

split array and hashtable code out into a new file

clean up some duplicated code around calls to add_to_property_pool

pad repo files with 0 bytes, not random memory

so you can do:
./razor import-yum
mv rawhide.repo rawhide.repo.orig
make
./razor import-yum
diff rawhide.repo.orig rawhide.repo

(doesn't work with system.repo at the moment...)

fix dependencies

s/import/yum/

update

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.

Fix repo format on x86_64 by using uint32_t instead of unsigned long