Read multiaperture daophot file

I have added a few lines of code in get_cols() function of daophot.py to enable it to read daophot files which contain multiple aperture data.

daophot3.dat is a sample daophot file with multiple aperture data.
Also added a test_daophot_multiple_aperture() in tests/test_read.py  for test.

This is related to Issue #904
Since table also works as a iterator, Python's all() was also working. But to be safe, i shall change it to np.all()