quick changes to finish mv-sst-fadvise work and hack in InsertQueue0 until threading rewrite.
two one-line changes (throttle related):  remove 1.3 hack to not count keys in write batch for throttle (AAE no longer needs and 2i suffers with it), and remove imm_micros from SetThrottleRate() since everything is overthrottling at this point (was needed to help 1.3)
clean up Google unit tests for Riak environment.
fixed most tests to use temp directory, just eliminated last test cuz I do not have patience to fix tests for code we do not use.
Following suggestion of Dave Parfitt to limit Writable files to only write operations.
remove #if/else/endif used during development
Merge pull request #89 from basho/mv-level-work4

Mv level work4