refs #612 SERVER-4858 give ProgressMeter better prints

ProgressMeters now have a _name attribute which is printed as part of each output to give the output more context

Conflicts:
	src/mongo/db/commands/mr.cpp
	src/mongo/db/index_update.cpp
	src/mongo/tools/dump.cpp

Updated by Mathias on 2012/12/17 to fix conficts and new PMs in indexupdatetests.cpp

Conflicts:
	src/mongo/db/commands/mr.cpp
	src/mongo/db/compact.cpp
	src/mongo/db/curop.cpp
	src/mongo/db/curop.h
	src/mongo/db/dur_journal.cpp
	src/mongo/db/index_update.cpp
	src/mongo/dbtests/indexupdatetests.cpp
	src/mongo/tools/dump.cpp
	src/mongo/util/mmap.cpp
	src/mongo/util/progress_meter.cpp
	src/mongo/util/progress_meter.h
	src/mongo/util/touch_pages.cpp