o Now print() for AgilentDataFile reports on chip type, chip dimensions, barcode and scan date.
o Package now exports Package object 'aroma.agilent'.
o Made package build on more recent versions of R, e.g. adding a NAMESPACE file, properly importing functions etc.
o CLEANUP: Internal readColumnsFast() for AgilentDataFile would
  not close an open pipe to a system call.
o BUG FIX: getBarcode() and getScanDate() only worked if force=TRUE.