better page duplication detection
mark pages as valid when we allocate them
growth test - write the first interval only once
GrowthTest - final call won't fail because of over-provisioning
comment in growth test
simplified ssd conf section in object_tests
term obj strategy - free object table; don't double-check for page duplication
use global hash table for pages (experimental)
fixed some issues with the page hashtable
re-add to hashtable on copyback
growth test - final object size should be a multiple of the initial size
over-provision in objects_in_ssd_ in object_tests; remove create-object failure assertions