[R] microsecond timestamp support

[Joel Reymont]

Does R have support for microseconds in timestamps, e.g. when reading this in

"Time","Include","Kind","Duration"
2011-04-01 14:20:36.368324,Y,U,1.03238296509
2011-04-01 14:20:35.342732,Y,C,0.0252721309662
2011-04-01 14:20:34.337209,Y,R,0.00522899627686

	Thanks, Joel

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