These two parameters (defaulting to 512k) control
the amount of erlang file buffer space to allocate
for delayed_write and read_ahead when merging.
This config parameter is *per merge task* of which
there can be many for each open HanoiDB; and again
multiplied by number of active vnodes in Riak.
As such, this can config parameter is significant
for the memory usage of a Riak with Hanoi, but setting
it too low will kill the performance.
* Added copyright notices to files
* Added Apache 2.0 License file with permission from Kresten/Trifork
* Changed the handle from "Db" to "Tree" because... it made me feel better
* Other minor changes here and there
