implement fork+exec (and by the way, fix the build...)

allow filtering history by paths in 'got log'

scan upwards for git repositories

provide a compile-time toggle for object caching

rename zbuf to inflate

add an object id cache which backs the object cache

undo previous; too much mixup in one data structure

store recently accessed objects at front of cache lists

add some disabled refcount debug code

size object caches independently of each other

add a commit cache as well

no need to manually count elements of a set

add a tree object cache to struct got_repository

introduce struct got_object_cache

implement repository object cache via object_idset