Adding a .mailmap file to the top level of the repo

This file helps avoid duplicate/redundant entries in the output of
'git shortlog -s'
PointLocatorTree could print out a lot of noise when it fell back on linear search.
Added a _verbose flag (defaults to false) to optionally turn this noise off.
Merge pull request #409 from dknez/point_locator_quiet

PointLocatorTree could print out a lot of noise when it fell back on linear search.