Added new ${DATADIR} that points to atest/testdata directory to ease referencing files under that dir. Also little cleanup.
Added new ${DATADIR} that points to atest/testdata directory to ease referencing files under that dir. Also little cleanup.

fiuba08/robotframework,waldenner/robotframework,ldtri0209/robotframework,waldenner/robotframework,ldtri0209/robotframework,ldtri0209/robotframework,waldenner/robotframework,waldenner/robotframework,fiuba08/robotframework,fiuba08/robotframework,ldtri0209/robotframework,fiuba08/robotframework,waldenner/robotframework,fiuba08/robotframework,ldtri0209/robotframework