prototype code to vary sizes of mmap files based upon function.
clean up redundant code to single RecoveryMmapSize() call.  Add suggested option from github user licenser.  Fix all unit tests.
oops, forgot on place that needed RecoveryMmapSize() added.  Nice to have a good code reviewer.  Thank you ajs.
Merge pull request #132 from basho/mv-write-sizing

Mv write sizing