* allow ng-find to return free/avail slots
also pulled out Mallocng.find_slot which returns the Slot instead of just the address
* better slot_state calculation, print it with ng-slot*
* propagate group/meta info when going through find
* add GroupedSlot to propagate find_slot information
* show GroupedSlot data to user when local reading fails
* gate the search behind a config option
* sanely handle insane slots
* use alt values for some meta fields
* get rid of set_padding
* add extra line for visual clarity
* autogen docs
* fix extra alignment
k4lizen