SERVER-16342: remove some snapshot global data that doesn't make sense any more
SERVER-16342: formatting of top.
SERVER-16119: faster WT shutdown race avoidance
SERVER-15595: fix devnull engine and add a test
SERVER-15595 fix unittest link error
StringMap for command maps
don't append --storageEngine if there already is one specific in test
SERVER-15849 add test for removing a chained member